RE: looking to slow my trainner down without a new engine?
I played with the CG on my Skylark 70 just as you suggested. I ended up with a plane that will do the circuit just as pretty as you can imagine. Then, I follow the downwind, base, final type of approach, following the "rules", and it glides in just about perfect each and every time.
One day, I was flying with my head up my butt.. I had the wind backwards, and was actually landing with the wind rather than with it on the nose. The landings were long.. every darned one of them, until someone said that my downwind landings were nice, but long. I looked at the guy like he had three heads, then suddenly realized what I was doing. But, even the long landing approaches were nice because everything was right (except for having the nose into the wind, of course).
I pretended that I had intended to land that way, we all had a good laugh about it, then I proceeded to land correctly. Geee.... the thing landed right in front of me for some reason. BUT, again, the flair at the very end of the glide slope was pretty as a picture... and it was because the CG was in the sweet spot.
CGr.