Joe, just curious, how far back did you move it? You are correct, if you do nothing more but move the CG back a tad you will feel the elevator get more effective. As you stated before CG will effect everything. One thing that I try to do is make a single adjustment at a time and then put 10 flights on the adjustment until I decide to keep it. In this case when moving the CG back I would have reduced elevator throw at the same time. I would have considered this one adjustment and then flew it for a couple outings. When the adjustments get this small I feel I need to fly them a while to rule out a habit we have developed around the airplane.