Well....

Actually, you can't really 'just install 8411's' as they don't FIT, and the resulting buldge could cause a buffet or flutter. We are talking about 200+ mph here. Granted, it likely would not, but I don't really want to test that theory (and it is ugly).
I would say, that I have flown BV's personal BC with a P120 on it, and that plane gets wrung out with no issues. It never feels soft!
All of this does make me think twice as I am finishing my Bobcat... and I have always liked the simplicity of the 4.8 v system.
BV runs a regulator at 5.2v I think. Most of the '4.8' packs I have tested seem to hold 5.0-5.1v with a pretty good load.... Still, I think I may be ordering a 6v pack and regulator.
My Atv's are up arround 130% to get the 1-3/4" throw, and this is good. Seems to have a lot of torque even on 4.8v.
Anyone running 110% or lower ATV to get the throw should think hard about getting in there and changing the linkage to get a better mechanical advantage, and more torque at the elevator. (use more servo rotation) Also, because the wheel is rotating, the further you rotate it, the 'shorter' the perpendicular moment arm is getting, so the guys using higher ATV's are getting a double advantage at higher elevator deflections! This is really evident on mine.
D