If you can set your ailerons up so that the inboard of them is flush with the wing and the tips are up a little then just go with that.
It will just be like washout to the tip and will if anything help your slow speed flight.

What is the wing and aileron covered with?
It looks like shrink film of some sort,,,, Well the wing any way,,,,,so carefully twist the aileron in the direction it needs to go and apply some heat with an iron (clothes type or covering iron if you have one) very lightly and heat up the covering where it gets a bit loose. This should take out a small twist/warp.

Warning!!!!!! Hold the iron just off the covering and start cool and work up to a bit warmer till you can see the covering tighten.

Sorry i dont know how much you know and wish i was there to hepl.

Best of luck alienx

Brad