Nice frags.
I think building muscle memory is a long process which takes years like buliding muscles in bodybuilding. I don't know if I'm right, but I think you should have the same 360°cm hipfire/ADS sensitivity for any game whatever the fov is. As a Rainbow six siege player who train on CSGO, Aim Hero and Quake Champions (it sounds strange I know), I noticed that when i unified my sens, even though the fov are different for each game, I was improving my aim and my flick shots etc.
I convert my sens only for the scoping.
I feel really comfortable that way and I still see improvements. I'm having back the ease I had since I stopped adapting my sens to the different fov each game had.
I might be wrong. I don't know, but even Kovaak said on his youtube channel (if I remember well, on his video of sensitivityMatcher v1.0 or v1.3) that fov doesn't have an impact on your sens. I don't know what to believe to be honest. I unified my sens recently, so it might be a placebo effect. I have to try it much longer to say if it is true or not.
Sorry for my English