Tuning Overkill

So I have my M3 running around 900 FPS for long shots but where I am at now with pellets btw. I am getting a lot of squirrels and little rabbits at like 25 yards max, its a .30 caliber 600mm barrel, do you think I need to tune my M3 way down since I'm not taking those long target or kill shots as much? And what does anyone recommend as a good speed for these close-up shots? 
 
the speed it shoots accurate at .. my main concern is random predators after muy chickens including squirrels, yes they chase the hens trying to lay out of the coop when they 'take over' the food .. my yard is about 100yX75 plus the surrounding30-40y comes into play occasionally and 'every' shot is different usually, all different ranges .. speed doesnt matter, the only concern is hitting and taking out what your after .. slugs dont matter, enrgy transfer doesnt matter , etc etc ..its all shot placement and ability to hit things in varying conditions - up, down, sideways, through cover, moving ... you need to know how your gun shoots in every corner and situation .. jcking off adjustments and different pellets all the time doesnt lend itself to grabbing the gun and nailing something offhand real fast .. pick what works good and you can use every time and adjust your gun accordingly and keep it there .. the rest is learning the shots and angles ..
 
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Try to see if you can get your impact to shoot 650fps with your HS on Min and you can have higher speed on higher settings. 




Edit: I was in the same boat as you, 25-30 yard shots and impact was overkill but more importantly down right dangerous. All I shoot now and days is .177 between 4-8 FPE, 8 FPE is plenty on squirrels out to 50 yards with the right pellet and placement. Made me a much better shooter along the way too.