GJEFFERS - Thanks for the info on the pushrods. I really like the way you did that. Thanks!!!
TOWERS - The other guys covered about everything I was going to suggest. Their advice is right on the money.
As far as GC goes, put it about where the information that came with your plane recommends, and then move it (Usually back), from there. If you get it too far back, you will kinda get a "Mushy" feeling on the elevator. When inverted, you should only have to put a little down pressure on the elevator stick. At least thats been my experience. Maybe one of the other guys can put that into better words than I can. Also, remember to always check your trim, after making a CG change. You will usually need a click or two.
Changing to a 13X4 or 14X4 is going to really make your plane more "U-Can-Do" like. Low and slow is the thing with these planes, they dont like to go fast.
Have fun,,,,,