I read a lot of articles lately about speed work. some people say for the bench press you should use 60% of your raw max bench. i know you either use 50 55 or 60% which is better. also i read that a wide grip is best for speed work but when i go wide with the bands i get a lot of pain kind of in the joint between my shoulder and chest. oh also since bands place a lot of stress on tendons. would it be a good idea to do speed work down to like a one or 2 board to eliminate joint pain or damage? thanx for the help.