i am in the process of moving down to 15lb. i am still using a 16lb mutant cell that is working so well i am leary of changing. but for health reasons i will need to. if i do get another mutant, and drill it exactly the same, will it react the same as the 16lb ball? i dont believe it will. if it wont, what do i need to do to get the same reaction from a 15lb ball?