Disclaimer: These tips are for the blog author, pls seek professional instruction as this sport may be dangerous!
When I have to muscle up a very steep section this is what works well for me:
Imagine someone attached ropes to your elbows and pulling on them up so they are parallel to the chest line (or armpit to armpit line). Elbows are bent and are pointing up.
This prevents the front wheel from going up in the air and puts more weight slightly forward.
May 12, 2012 update:
Do NOT keep elbows in this extreme forward position when descending.
Correct descending elbow position is as if doing a pushup or holding a basketball at chest level
