If you want to shave down weight, then you should shave the bumper guard down. Don't remove the guard completely because you need the grommets to prevent the string from biting into the frame, and also, the damage to your frame will be quite extensive from contac to the court. There's a reason that headguards became quite popular- early rackets without headguards are absolutely dreadful to look at after a while due to the obscene number of paint chips, scratches, etc.