Dude you might better check your calculations again. You are crazy if you think a standard servo is gonna stand a 60 mph Wall. No way. Not on a 90 size plane and probably not on a 60- size. And dead eye there is very very little force on a control serface in a hover. Heck, a micro servo would work on a 120 size if all you were gonna do is hover. The only pressure on the sufaces in a hover is from the prop wash. Now i know that if you get the nose down a little it may take a little more power to get it back up, but it is an insignificant amount. In a hover torque has little meaning. Now lets get to flying straight and adding a control movement. The rudder has the most control surface area and a longer chord on most planes so it will take more power per degree of throw than the elevator. Also the split elevator is mostly for setup. Now on some planes both elevators halves put together may be larger than the rudder so then they would need more power than the rudder. Basically it does depend on the plane but mostly like what was said about the longer chord, it and surface area determine how much torque is required.