Trbo323

so i was at a local feild not too long ago and was having a few problems with consistency, my reg (max flo) couldnt seem to hold a fps from shot to shot it was going +/- about 20 to 25 from shot to shot, is there anything i can do for this?? does the max flow just suck?? if so is there any suggestions for a new reg (preferably one that doesnt cost me an arm and a leg) or does my max flo just need some tlc?? if thats the case ill probably just send it in to the shop. thanks for any help