BTW .. with Allards Sketch you don't need a Calibrate switch any more as calibrate is included in the settings menu. So long as you
have a function button you can do calibration. You mentioned the USB sensitivity is low. Did you remove C91 and C92 off of the RF board?
With these removed the USB sensitivity is much improved and there is no impact on LSB. These are redundant parts that are there for the analog VFO
implementation which has been replaced by the Raduino so there is no impact other than to improve USB operation.
Michael VE3WMB / VA2NB