Mini Mags it is.
I don't think we should 'fix' problems in new guns via changing recoil spring or other parts. It's a brand new gun, it should work properly and if the recoil spring needs to be changed, my opinion is that the manufacturer should take care of it.
Joining the "club" - bought a brand new SR22 last Saturday from FS, shot about 80 rounds and had one misfire, cartridge stuck in the chamber. Took it out and reloaded and it fired fine. Ammo was CCI, also picked from FS.
I guess I'm gonna have to fire more while it's new to make sure there is...