Man, I don't know how or why, but I can never get Alternate Picking I up to speed while I can actually do Alternate Picking II perfectly fine at top speed. I don't get it. I guess my left hand doesn't really move that fast in accordance with my right hand when I'm doing a 3 sixteenth notes per string but they work fine and in sync when I'm playing 6 sixteenth notes per string. I don't get it, man... Any suggestions?