Sniggemann, I had to reduce the elevator throws too. An important point to remember is that on most radios, the dual rates do not affect the trim movement. So while your stick response will be reduced by using dual rates, the trim response will remain the same. Therefore if the elevator is sensitive, which is the usually the case with hard skin wings, you should reduce the physical throw at the control horn by connecting the clevis further away from the hinge line. Increase the distance by about 25% as a starting point. That should make the trims about 25% less sensitive, and you wont have to use a high increment dual rate. You will also put less stress on the servos by getting better mechanical leverage.
Sorry cant say about the loop as mine tracked absolutely straight through big and tight ones. You might want to adjust engine thrust angle and prop size to get it right.