>The CAP is an aerobatic stunt plane; they are designed to be unstable so they can accomplish the stunts.
>Pattern planes are designed to be SMOOOOOOOTH...

The CAP isn't unstable. The airplane must be stable or we couldn't fly them. Most aerobatic airplanes whether scale or the present design trend toward long fuselages and smaller spans will have the CG just a few percent ahead of the Neutral Point. It makes both airplanes fly with less elevator trim either upright or inverted and requires less elevator input to accomplish maneuvers. I have a CAP that is just as smooth as my pattern ships (at least until I decide to interfere with it's flight path).

What will happen with the airplane that is balanced too far forward is that it flies level upright with a fair amount of up elevator trim. When the airplane rolls inverted it needs more down elevator to maintain inverted level flight. During a roll this results in a lot of elevator action and stick pumping.

I have one airplane balanced well aft and you just had to breath on the sticks to do rolls level. I put a heavier motor in and didn't pay attention to the new center of gravity. It now requires a lot more stick movement.