Welcome to the forum @hockeyrob. Your instructor had you going in the right direction. I noticed that you shift your weight back a lot in the backswing. This causes you to have to shift a lot forward on the downswing and may lead to fat shots. I would check out this thread. You have a lot of power and don't need to shift back to keep that power. A centered hip turn will make it easier to move the low spot of your swing forward. Keep us posted.
7/5/15 at 7:44am