sry for my bad english, i have a at700 which felt very head heavy at first. Then i put an karakal pu over the original grip which made it much thicker. Now besides having problems switching to backhand fast the head heavyness is almost gone. Is it just a feeling or does it really affects power? because the grip only weights several grams. the head is physicly as heavy as it always whas but it doesnt feel so.