I would make sure the fuse is straight. If not it will cause the vertical fin to be out of alignment and would need alot of trim to fly. If the fuse is straight then what I would do is make sure each wingtip is the same distance from the rear of the fuse and bolt it down there. 1/4" gap doesn't sound like much and probably is not for some people, especially on a repaired plane, but for some reason I like to make sure all of the measurements are within a few millimeters. A straight plane flys better. Also a couple of pics would help diagnose the problem.