Just install 8411(s) check your leads and never think twice about it
I have the Utmost respect for BV but I dont think a servo who's torque rating is that close to max flight load values should be the "Recommended" servo. Sure, the 3301's are probably sufficient for a BC on 500 power but I dont trust them on 20+ lbs. I prefer to have twice what I calculate the surface would need and know I'm never coming close to stalling a servo....
Todd