I don't have the 33% H9 CAP---but I do fly the Lanier 28% CAP. I think you'll find that all CAP's tend to be extremely sensitive around CG. I think this is a result of very large tail surfaces and relatively short tail moments. Anyway, the Lanier CAP is extremely "touchy" when CG is set according to "plan"---which is on the wing tube. Most people I know (non 3D) flying the Lanier CAP have moved the CG forward of the "plan" spec---by as much as 1" (depending on pilot preference). Mine is 3/4" forward of "plan" CG and my elevator expo is a -35% (Futuba). My plane is smooth as glass and very easy to fly. Your -99% expo just doesn't sound right---I would imagine you'd want expo in a range of -20 to -40%. A -99% expo leads me to believe you're unduly tail heavy. If your expo is moderate---say a -40% and your CAP appears to "porpoise" while in level flight, that's a sure sign you're tail heavy---move the CG forward until the "porpoising" disappears. As a temporary experiment, take a good size wrench, wrap it in foam and secure it inside your engine box---and test fly the plane. I'll bet it's much smoother and you won't need so much negative expo. If I'm right, you can re-arrange your batteries or servo's for a "permanent" fix. If I'm wrong, you can simply remove the wrench with little effort and return to the CG you've got now. Of course, if you're a 3D pilot, ignore everything I've said here. You'll want the CG aft and the plane very "touchy"---that's just part of the 3D tradeoff. Good luck,......WarpedWing.