Hello! Been watching alot of videos lately and i cant help but noticed how HARD federer hits the ball. Other than the technique i can see on video, i was wondering about other aspects: 1) what grip? Semi-western? he seems to hit a lot of spin too. 2) What string tension does he use low? I use a semi-western forehand.. when i try to go for power shots, i just delay my shot to the las moment and sort of do a slap shot if u will. When i try to change to a eastern forehand, my balls sail long..i guess this could be the low to high swing motion i am accustomed to. Would appreciate some feedback thanks!