Unless the GP is not up to their usual standards, you have nothing to fear.
My SIG Ultimate uses 4 ailerons, full-span, the scale plane full span, but bottom only.
Keep the control system stiff and tight.
Servos part-way out the span connected directly, not torque rods.
Chip Hyde's LARGE Ultimate uses full-span.
A light wing structure and a heavy aileron, or a long-chord aileron can join together into flutter, but the Ultimate, most likely not.