I didnt do enough flying to test what you said in your second paragraph............but I did do some thinking as to where the cg just might have been with the .90.........

I always set my cg to factory specs initially. This plane is no exception. The BIG difference is that I added the header tank AFTER balance. Thats 2oz of fuel in the nose that never went away. I also never ran the plane past half empty. Id have to fly it for 15-20 minutes to suck a 16oz tank dry with that .90.

So the cg must have been far more foreward than I had thought. It used to land dragging the tail a bit, but I think the extreme difference in fuel and cg point made all the difference in the world as to how it flies now.

So heres what Ive done. I fueled up the plane (since thats where it flew good) and marked the cg. I then drained the tank, moved it back 3 1/2 inches to the wing tube. Then I brought the battery foreward to set the cg where it was marked with the tank full.

I hope I can get by with having the tank farther back without causing a lean condition. I opened up the pressure nipple on the exhaust as far as safely possible. I also ran 1/8" line for the pressure line. I believe the 1.20 makes good enough pressure to push the fuel another 3 inches, but I guess we will see.

I hope to do some more test flights on friday, so I can have some fun with her this weekend.

I'll keep you posted.