You shouldn't have to GRIND anything!!! Your peep is probably lower than previously, and causing your sight to seem out of adjustment. New stings and timing a bow up help, but they don't make that much difference. Have your peep adjusted, and DON'T go GRINDING things, that's NOT the right answer!!!
Good to hear the bow is shooting well, now get things adjusted the RIGHT WAY!!!
Shoot 'em straight......