Check the manual for the suggested throw for that surface. Figure you might need half again that throw if you plan to stunt the airplane because suggested throws often are minimal to make the airplane less prone to crash at the hands of a less than average modeler. Mfg's are funny that way sometimes.
If the surface will do that 1.5 deflection, then check another thing.
If the surface is difficult to move, it's worth checking why. It's not always the hinging. The ends of ailerons can rub against wing fairings.
Do another thing that gives you some info. Check and see for a fact if any hinges are not centered, or if any are out of line with the others. When one is, it will usually be little problem right around neutral, but can cause a fast increase of resistance as the surface deflects.
If you've only got one or two that are obviously out of line, it'd be worth the time and experience gained to see what it takes to fix it.
What it takes to fix it might not be too tough. It's entirely possible to fix just one CA hinge. Cut the bad one and move to the side of it. Deflect the surface out of the way, and cut slots in the wing and aileron for a new hinge. Either use a Dubro flat pinned hinge there or bend a CA in the middle and stick it into the slot. CA the CA as normally done. If you use the Dubro (which is going to be easier to insert) glue it with hinge glue. Hinge glue is made for hinges like Dubros and is dead easy and simple to use.
If you've got a number of hinges out of line, the decision gets tough for some. But I like being anal. It makes me fix mistakes that I discover later bothering me. And people wind up wanting my airplanes for more money than they cost me because they know I don't do things that just get by. The decision is actually an easy one most times. Are you happy with it? If you're unhappy, do what it takes to be happy. This hobby is all about happy.
BTW, no matter what happens with this one aileron, you've learned a very valuable lesson. Check every hinge location in every ARF you build. Out of the last 10 or so I've built, I can't think of but a couple that didn't have new hinge slots cut up front. BTW, you can very easily cut the new entry right at the same location as most badly aligned slots. The CA hinge doesn't have to be straight inside the wood, just solidly glued. The old piece of slot soaks up CA just like any slot does. And glues closed as solid as a rock.