
hmm how do you accomplish squats?
Well add hack squats and do another hamstring exercise. Stiff dead lifts are the king of hamstring exercises so you're missing out big time. I can tell the reason your legs are not growing is cause you have one exercise for mass in there, squats. Leg extensions will not build mass. Try Hack squats or something on a power squat machine. Do laying leg curls, then single leg curls. There is a lot that could be done but I think you get the idea of what I am trying to say. You need more power movements in there.