Terry,

Sure, it's your model.

Seriously though, moving the wing back also affects the tail action. It should probably go to the same distance aft of the wing as on your tailheavy one. Wood is lighter than engine/tank/wheels, so you should still get a better CG position. I presume yours is from plans for the SIG profile bipes?

Should help, unless, that is, you'll use it as a Classic entry. Does it qualify? I forget when SIG brought out the profile bipes... If there's an appearance point judging guideline, you'll take some dings off that score, at least. Some organizers might take objection to a pretty visible mod like stretching the nose (which has the same effect as - and looks a lot like - moving the wing back. Since you're cutting the wood, anyway, stretching the nose pieces is probably easier.).

Built up aft fuse is a good idea. I will try that and also I want to use a different airfoil. Like you said: The ribs are pretty thin. I am happy with how it flies, I just really think it could do better. By the way, This is the Sig Bipe. Right now I am using a Fox 35 and a Sullivan tank. I don't know if any of my other engines would be much lighter.
Thanks for the info!
Terry