I'm building a 1/6 scale U-2, 13' wingspan. The first ones with a 80' span had just ailerons. When the TR-1/U-2R was built the increased w/s required the addition of spoilers for roll control.
To those with large gliders: do you supplement the roll control with spoilers?
My thought is to mix in some spoiler after a certain amount of aileron, similar to what some airliners do.
Of course they could also be used together as speedbrakes for the descent.

Any thoughts?

Jack