Dont boosted the nittaku h 3, the sponge is different, after you boosted it won't last a week. And that rubber is way too heavy. After the rubber is dead, just throw it away.
If just short game problem, use your elbow to control the racket, move your foot for position. Will never fast. No matter what blade you use. It's not about your blade in short game, it's your technie.