landonsmith-
Higher head speed does increase stability. Flat-bottom airfoils create more lift. I don't have any experience with them. I think you should give 'em a try if you are up to the task! See the quote below:
ORIGINAL: Thomasp168
You can use BLADE CP blades in the AXE. they're a little bit shorter, so your headspeed is up. I'm lifting off at below half throttle with a full charge (1320 LIPO). I use the flat bottoms, about 7 bucks a pair less than the AXE blades. the fit is a little snug, but they work great.