I am sure it does increase slightly, but I didn't even notice the extra weight b/c I was so happy that it went "bang". Currently I have a factory trigger spring, FSS sear spring, 11lb recoil spring & 7lb striker spring. I may change to a heavier recoil spring if I run into any issues. I'll be shoooting many rounds soon as I have a class near end of this month.
Wow! I'm surprised this even stays in battery. Mine is set up with competition striker spring and 13 lb recoil spring. I've never tried an 11 lb one, but might have to try it.
It doesn't stay in battery w/ much force. It seems like I can stare at it and it will slightly move out of battery. I will change to either a 13 or 15ib recoil spring.....it all depends on which is more reliable. Don't get me wrong, I enjoy the felt recoil with a 11lb spring.