I just re-read your post and noticed it is unclear if one aileron is twisted or if "One tip of the [one] aileron is slightly up while the other [aileron's] tip is slightly down."

In any case, a model like the Revolver was probably designed with untwisted ailerons in mind. It's not usually emphasized but ARFs usually benefit greatly from our going over the entire covering job, shrinking every bit of film with an iron or gun. While doing that it's even more worthwhile to inspect the surfaces for warps and removing them as we go along. The covering of open surfaces usually provides a significant amount of the rigidity needed. ARF workers aren't really concerned with anything other than the wrinkles their boss would notice. And ARF mfg's often aren't concerned with warps they think most wouldn't notice.

Both ailerons should probably be straight. They most certainly shouldn't be different from one another, unless you want washout.