Fx mavrick tuning hammer screw

[Zaid]

Fx mav 22cal So i upgraded hammer to meduim weight hammper spring tunned it to 960fps at it would vary around 9 fps
which was perfect I was fine with tht..

NOW i tried going up to 1000 i did and it was tuned poopty accuracy so i went back down but i cant get the fps to stabalize it keeps bouncing so ill shoot 10 shots and the will vary from 970 to 930 which is poop NEED HELP PLS

 

[Zaid]

best shot sting i got for now need help

 

[Rich_B]

Try turning the screw 1/4 turn and shoot some shots across the chronograph and repeat. Go both up and down from your current setting and when it starts to level out, then go to 1/8 turn until you find the sweet spot. Let us know what comes of it. Could also be a possible chronograph issue.