I bomb down the hills in Austria with mine full friggen tilt and have never had an issue with it being unstable. .as a matter of fact, I went much faster (well, as fast as gravity would let me) fully in control, where as one day earlier on my 2004 non rocker board I was enviously watching some due gassing it down a hill where all I was doing is flying from bumb to bump in the afternoon.
Test if ya can, but its a great board. I have the 159 version, maBe its a bit stiffer? Great board.