ORIGINAL: Korps
I needed some up elevator trim though to fly level. I'm going to take a bit (only 10 grams or so) out of the nose for now. But as the plane was it flew great. Had some trouble with knife edging. The plane keeps pulling to it's belly in a knife edge. Don't know if it was my fingers, but anyway.
Before changing weight, there are some other tests you should do first. Do a google search for a "Trim Chart". There are several out there. The behavior you describe (required up elevator to fly level, but pulls to the belly in knife edge) indicates to me you're not dealing with a balance issue, but more likely either an engine thrust angle or wing incidence issue. You previously said you rebuilt the firewall, which is what makes me suspect that. Requiring up elevator to fly level does not by itself mean the plane is nose heavy.
Brad