It's not a revolution, but i just discovered  how actual WR (43"1x) is done.
The usual strat. (the Nasmic strat.) is changed a bit.
Instead of hitting the tree, you have to hit the wall at the right of the tree itself.

I tried and it works, my best splits on each lap are now 0.05 faster (just a bit then), so globally at least 0.15 can be saved.

Anyway i'm yet far from Nasmic time.

Edit: an example of where to hit the wall (not sure this is the optimal position, but it's surely faster than the tree for me):
http://www.termopilucco.com/mksc/pc2ndlap.avi

termoPilucco