Aileron response on the Predator is minimal. I would almost suggest using everything you can get out of it, until you get it trimmed for flight.

Some of the predators did have an issue with the incidence of the tail. If it took a lot of clicks of elevator to get it to fly level, you either have an inceidence problem or a balance problem.

Take care of the balance first, and then adjust the incidence of the tail to compensate.