Did BVM design the dual elev servos for redudancy? If so, why did he not have dual servos on the ail(each side)? It would have been extremly easy to do so and hence have a more robust and redudndant system. I think JR9411 are the best choice for the BObcat all around including dual 9411 on the ail!!

On my XL, I am planning on 9411 on rudd and elev and 8411 singles on ail (since it is already built by a master scottsman!!!) otherwise I'd go with dual ail each side.