I wouldn't do anything to the mechanical setup of the model to "improve" the flying. Rather, I'd just take whatever odd flight characteristics you're noticing as a challenge to improve my stick control. When I was flying my Kyosho Cub I found that I would often be using cross control (rudder and opposite aileron) to get a nice looking turn. I also found I could fly almost as well with just rudder, elevator, and throttle.

I miss it.