im not an expert on this stuff, but you seem to have a very open stance when you hit your forehand, i dont know if this is because of the grip you are using or what, it would seem to robb you of power when hitting like that, turning more on the side your planning to hit on might help
it also seemed like you were hitting from your heels, thats cant be good, i know nadal does it, but i dont think he has the best fundamental techniques in the game, from what i've heard about his style
i like to lean into my shots more and turn more to really get a good wackk at the ball
i turn to the side as much as possible and go from low to high as i lean into and up to the ball and direction where i am sending the ball, and always finish over my shoulders
again i dont knwo if the grip your using is a different hitting style all together than mine, i use a eastern grip, you seem to be using a western grip of some kind from the follow through you have