bugsiegel,

I am not sure if this is the answer to your question and I am by no means an expert on this but I had about one degree of down thrust on my saito 100 that sits on my .90 edge. The plane flying inverted at mid to high power had a tendency to climb nose up, and when landing slowing to idle speed it had the tendency to nose up, after adding two small washer's to the bottom of the motor mount it solved the problem. So the plane's engine had a tad bit of down thrust, about one degree.

Randy