If you want max aileron force -for min aileron servo cost - do this:
use one servo per aileron-- small -like the 9011 then----- link the two servos together across the fuselage
This will take some work to get the link (a carbon fiber rod) to both sustain pull /push.
The advantage is that the work of holding the aileron POSITION is now transferred to the interconnection as one aileron can no longer operate independently
Also when operating the ailerons - the load is absorbed by both servos- note that load is not equal on both servos starting a roll.
The amount of power required is actually quite low - because aileron forces -to deflect ailerons- is quite low (notwithstanding 1940's movies ) Once the model starts the roll -the forces actually reduce even further. This ain't a Piper Cub
99% of the work for the aileron servo(s) is holding servo from bumping up and down and if --the ailerons are tightly , mechanically coupled - this load vanishes.
Fotr the armchair set - the ailerons on a 330 EXTRA -a full blown aerobatic craft powered by an A0540 - can be operated easily with two fingers on the stick. This is because they are coupled (as are all small craft and they have aerodynamic assists (spades) and are properly balanced.