hmm, my rps is only around 33rps and 400 fps 1.86J, 0.25g. battery 1000 mah with 35C "advert" ( Main goal to hit 40 or 40+ rps ). HS motor 50k rpm shs 13:1 light swiss cheese. 16 awg basic mosfet. maybe try to use lower spring strength a bit and other battery.