Reloads with CA 10 round mags

I’m getting into USPSA/competition shooting (class is next month) and I’m hoping to get some insight/recommendations on reloading with 10 round CA compliant mags. I have an M&P 2.0, and reloading with one in the chamber and a full mag is surprisingly difficult- like, slam it in and then smack it again, with a fair amount of force, to get it seated. It’s much easier with only 9 rounds. My concern is that I’ll fumble this or screw it up while reloading quickly or on the move.

I’m sourcing some pinned/blocked compliant magazines which to my understanding don’t have this issue, but for the sake of this discussion let’s assume I don’t have those in hand, and that I haven’t found my “freedom week” magazines yet.

Should I start with a full magazine and just load 9 rounds in the others? Maybe cut a coil off the spring?