diff --git a/src/nimble/NimbleBluetooth.cpp b/src/nimble/NimbleBluetooth.cpp
index cb4d7abbf..022aa1c16 100644
--- a/src/nimble/NimbleBluetooth.cpp
+++ b/src/nimble/NimbleBluetooth.cpp
@@ -630,8 +630,8 @@ class NimbleBluetoothServerCallback : public NimBLEServerCallbacks
     {
         LOG_INFO("BLE incoming connection %s", connInfo.getAddress().toString().c_str());
 
-#if defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C6)
         const uint16_t connHandle = connInfo.getConnHandle();
+#if NIMBLE_ENABLE_2M_PHY && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C6))
         int phyResult =
             ble_gap_set_prefered_le_phy(connHandle, BLE_GAP_LE_PHY_2M_MASK, BLE_GAP_LE_PHY_2M_MASK, BLE_GAP_LE_PHY_CODED_ANY);
         if (phyResult == 0) {
@@ -639,6 +639,7 @@ class NimbleBluetoothServerCallback : public NimBLEServerCallbacks
         } else {
             LOG_WARN("Failed to prefer 2M PHY for conn %u, rc=%d", connHandle, phyResult);
         }
+#endif
 
         int dataLenResult = ble_gap_set_data_len(connHandle, kPreferredBleTxOctets, kPreferredBleTxTimeUs);
         if (dataLenResult == 0) {
@@ -649,9 +650,10 @@ class NimbleBluetoothServerCallback : public NimBLEServerCallbacks
 
         LOG_INFO("BLE conn %u initial MTU %u (target %u)", connHandle, connInfo.getMTU(), kPreferredBleMtu);
         pServer->updateConnParams(connHandle, 6, 12, 0, 200);
-#endif
     }
+#endif
 
+#ifdef NIMBLE_TWO
     virtual void onDisconnect(NimBLEServer *pServer, NimBLEConnInfo &connInfo, int reason)
     {
         LOG_INFO("BLE disconnect reason: %d", reason);
@@ -797,7 +799,7 @@ void NimbleBluetooth::setup()
     NimBLEDevice::init(getDeviceName());
     NimBLEDevice::setPower(ESP_PWR_LVL_P9);
 
-#if defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C6)
+#if NIMBLE_ENABLE_2M_PHY && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C6))
     int mtuResult = NimBLEDevice::setMTU(kPreferredBleMtu);
     if (mtuResult == 0) {
         LOG_INFO("BLE MTU request set to %u", kPreferredBleMtu);
diff --git a/src/platform/nrf52/NRF52Bluetooth.cpp b/src/platform/nrf52/NRF52Bluetooth.cpp
index 34a185b28..c30c8c5ed 100644
--- a/src/platform/nrf52/NRF52Bluetooth.cpp
+++ b/src/platform/nrf52/NRF52Bluetooth.cpp
@@ -64,6 +64,16 @@ void onConnect(uint16_t conn_handle)
     connection->getPeerName(central_name, sizeof(central_name));
     LOG_INFO("BLE Connected to %s", central_name);
 
+    // negotiate connections params as soon as possible
+
+    ble_gap_conn_params_t newParams;
+    newParams.min_conn_interval = 24;
+    newParams.max_conn_interval = 40;
+    newParams.slave_latency = 5;
+    newParams.conn_sup_timeout = 400;
+
+    sd_ble_gap_conn_param_update(conn_handle, &newParams);
+
     // Notify UI (or any other interested firmware components)
     meshtastic::BluetoothStatus newStatus(meshtastic::BluetoothStatus::ConnectionState::CONNECTED);
     bluetoothStatus->updateStatus(&newStatus);
@@ -119,7 +129,7 @@ void startAdv(void)
     Bluefruit.Advertising.addService(meshBleService);
     /* Start Advertising
      * - Enable auto advertising if disconnected
-     * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+     * - Interval:  fast mode = 20 ms, slow mode = 417,5 ms
      * - Timeout for fast mode is 30 seconds
      * - Start(timeout) with timeout = 0 will advertise forever (until connected)
      *
@@ -127,7 +137,7 @@ void startAdv(void)
      * https://developer.apple.com/library/content/qa/qa1931/_index.html
      */
     Bluefruit.Advertising.restartOnDisconnect(true);
-    Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
+    Bluefruit.Advertising.setInterval(32, 668); // in unit of 0.625 ms
     Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
     Bluefruit.Advertising.start(0); // 0 = Don't stop advertising after n seconds.  FIXME, we should stop advertising after X
 }
@@ -272,6 +282,24 @@ void NRF52Bluetooth::setup()
     // Set the connect/disconnect callback handlers
     Bluefruit.Periph.setConnectCallback(onConnect);
     Bluefruit.Periph.setDisconnectCallback(onDisconnect);
+
+    // Set slave latency to 5 to conserve power
+    // Despite name this does not impact data transfer
+    // https://docs.silabs.com/bluetooth/2.13/bluetooth-general-system-and-performance/optimizing-current-consumption-in-bluetooth-low-energy-devices
+    
+    Bluefruit.Periph.setConnSlaveLatency(5);
+
+    // TODO: Adafruit defaul min, max interval seems to be (20,30) [in 1.25 ms units] -> (25.00, 31.25) milliseconds
+    // so using formula Interval Max * (Slave Latency + 1) ≤ 2 seconds
+    // max slave latency we can use is 30 (max available in BLE)
+    // and even double max inteval (see apple doc linked above for formulas)
+    // See Periph.SetConnInterval method
+
+    // Tweak this later for even more power savings once those changes are confirmed to work well.
+    // Changing min, max interval may slow BLE transfer a bit - bumping slave latency will most likely not.
+
+
+
 #ifndef BLE_DFU_SECURE
     bledfu.setPermission(SECMODE_ENC_WITH_MITM, SECMODE_ENC_WITH_MITM);
     bledfu.begin(); // Install the DFU helper
@@ -300,7 +328,7 @@ void NRF52Bluetooth::setup()
 void NRF52Bluetooth::resumeAdvertising()
 {
     Bluefruit.Advertising.restartOnDisconnect(true);
-    Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
+    Bluefruit.Advertising.setInterval(32, 668); // in unit of 0.625 ms
     Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
     Bluefruit.Advertising.start(0);
 }
diff --git a/variants/nrf52840/heltec_mesh_node_t114/variant.h b/variants/nrf52840/heltec_mesh_node_t114/variant.h
index 28404fcce..03c5aafd2 100644
--- a/variants/nrf52840/heltec_mesh_node_t114/variant.h
+++ b/variants/nrf52840/heltec_mesh_node_t114/variant.h
@@ -21,8 +21,8 @@
 /** Master clock frequency */
 #define VARIANT_MCK (64000000ul)
 
-#define USE_LFXO // Board uses 32khz crystal for LF
-
+//#define USE_LFXO // Board uses 32khz crystal for LF
+#define USE_LFRC    // Board uses RC for LF
 /*----------------------------------------------------------------------------
  *        Headers
  *----------------------------------------------------------------------------*/
diff --git a/variants/nrf52840/tracker-t1000-e/variant.h b/variants/nrf52840/tracker-t1000-e/variant.h
index 5b6719e12..ff63a4155 100644
--- a/variants/nrf52840/tracker-t1000-e/variant.h
+++ b/variants/nrf52840/tracker-t1000-e/variant.h
@@ -22,7 +22,9 @@
 /** Master clock frequency */
 #define VARIANT_MCK (64000000ul)
 
-#define USE_LFXO // Board uses 32khz crystal for LF
+//#define USE_LFXO // Board uses 32khz crystal for LF
+
+#define USE_LFRC 
 
 /*----------------------------------------------------------------------------
  *        Headers
diff --git a/variants/nrf52840/wio-sdk-wm1110/platformio.ini b/variants/nrf52840/wio-sdk-wm1110/platformio.ini
index 2deeeedcf..7c11ef6f6 100644
--- a/variants/nrf52840/wio-sdk-wm1110/platformio.ini
+++ b/variants/nrf52840/wio-sdk-wm1110/platformio.ini
@@ -8,7 +8,18 @@ extra_scripts =
   extra_scripts/disable_adafruit_usb.py
 
 # Remove adafruit USB serial from the build (it is incompatible with using the ch340 serial chip on this board)
-build_unflags = ${nrf52840_base:build_unflags} -DUSBCON -DUSE_TINYUSB
+build_unflags =
+  -Ofast
+  -Og
+  -ggdb3
+  -ggdb2
+  -g3
+  -g2
+  -g
+  -g1
+  -g0
+  -DUSBCON
+  -DUSE_TINYUSB
 build_flags = ${nrf52840_base.build_flags}
   -Ivariants/nrf52840/wio-sdk-wm1110
   -Isrc/platform/nrf52/softdevice