keeping body straight during muscle up on a straight bar

hi guys i am new to this forum here i wanted to find out how to improve on keeping your body straight during a muscle up on a straight bar not leaning over at all on the top here is my video  tell me what you thinkhttp://www.youtube.com/watch?feature=player_detailpage&v=HOcCB5r0YXw

 Because you are moving around the bar, your body has to do something to counterbalance itself compared to on rings when you are moving through the rings.

Well the best muscle up with no lean that I ever seen is one performed by Andreas Aguilar and on a bar this one down below. The best way I think could be try slowest ones with a false grip and from workout to workout try to minimize the lean