Whats interesting about this scenario is that I've been flying a 1/4 scale Aeroworks Edge 540 for a few years now with a 90oz rudder servo. That plane will high alpha KE at very slow speeds. Same 17-6 prop. max rpm 9000. Plane weighs the same, but smaller rudder. I'm about to try changing out my 8411, might have a bad one....

Kevin