ORIGINAL: bkdavy
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
I flew the plane after the firewall was re-built and trimmed it out. Then added the weight and I had to retrim. It is a bit nose heavy, but not so that it sours the flying experience. The reason I want to remove just a bit of weight is because the plane lands kind of hot - really the only reason. It's not really bothering me that much - must I want to try some 3D soon so then I'm going to have to take out a bit of weight perhaps.
But thanx for the advice - I will have a look at the trim chart to see if I can sort out the problem with the knife edge. It can also perhaps help me with a couple of other things I would like to know.