Are you legally bound to 10? I've seen things get weird with 8,9, 10 rounders due to the shorter spring and follower situation. I don't go lower than 20 if I don't have to.
If I'm shooting for groups, I always roll with a newer Gen 3 PMag. Colt/NHMTG/OKAY/Surefeed are my go to for non polymer.
The problem with most AR mags is folks keep em in use WAAAY to damn long. The beauty of a PMAG is their failure point...unlike the others where lip spread can be way too much, causing problems and you don't know it.