Never had a problem with my TS40, both with factory mags and factory mags with CZC Spring/follower kit, except when I tried 1.178" COAL. At that long, ammo were dragging inside the mag, so it went single shot. Factory ammo and reloaded ammo <= 1.170" are never a problem.
If you're going to compete, dump the shock buff. They work when shooting slow, but fails when driving the gun a little harder than usual