Halfpacker scuffing help.....

[JDF]

Ok, just learning to scuff halfpackers (other side of the bike as Elephant Glides) and I am running into major problems.  It took me about an hour, but I learned the balance point and I can pretty much scuff it forever. That's not the problem.  My problem is the bar starts to creep between my leg, and then it just turns into a freak-squeak.  When I see other people doing it, their handlebars are either further behind them, or they lean against the back of the leg.  What am I doing wrong?  I'd like to scuff these into halfpackers, so having the bars between my legs won't do.  Do I pull the seat up tighter?  Push it further away?

HELP!

Video of what I'm talking about:

http://www.youtube.com/watch?v=hEBPVsAs0vg
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[JDF]

Heelllllllllp?