[charnockpro]

one thing that no-one touched on was the back injury, in my opinion BStone is correct in saying you lack angles, but i would also suggest swinging wider and setting your wrists to create a good backswing position, in my opinion i think your arm swing is too long which creates a false finish to the backswing which will lead to sync problems, the wider pre set backswing will put less stress on the back and give your arms more space on the downswing.