Kanuck -

You shaved more than enough for the sensor... Unless you need to move the sensor leg closer to the trigger magnet, all the relief has to do is keep from smashing the part when assembled.

I'm not sure why your trigger spring would be an issue unless you were experiening mechanical bounce. Since you were dry firing I can only guess that the stiffer spring pushed it further away from the sensor.

A note for everyone to keep in mind, there WILL be tolerances on trip points of the trigger due to the sensor sensitivity band AND the relative strength of your trigger magnets. If ONLY the X7 had a mechanical trigger...