I have a Saito 0.91 and have flown quite a bit without weight, and with a 1 lb transformer bolted to the firewall.

Whenever anybody asks what the transformer is for, I tell them you have to convert all the german planes from 220 to 110!

Anyway, I fight the pitch axis all the time in the Fokker.. suddenly you loose 20 feet, then the slightest elevator movement makes it balloon up. I though it was tail heavy, but the extra pound doesn't really make that much difference. Tried shimming up the lower wing for slightly more angle of attack, but still little effect.

I realized I never had the problem when idled down on final, only at full throttle. I think the 0.91 may be a bit too much for this plane, it actually flys better at a lower airspeed.