edgeflyer, try making the cord of the wing larger.
I have mine out to 42" and now can do harriers walls and the like.
I haven't gotten good waterfalls yet but the larger cord helps with the high alpha flight.
I have also tried it on the cap x2 from the realflight site and it made a huge difference with that one, no more nasty stall, it just mushes along with the ailerons remaining very effective.

Lou