One thing that I noticed in my stripping issues was that the bearing in the two-speed housing was seizing up on occasions. You need to clean it after a few runs or replace it with a better bearing. I replaced mine with a Avid bearing along with replacing the plastic brace with an aluminum one and the stripping had dramatically decreased (still happens every now and again). I also heard that replacing the plastic upper deck brace by the engine with the aluminum one will definitely help with reducing the flex to the point of stripping gears.