On my Giant Aeromaster the stab and both wings were set a 0 degrees per the plans. I found that when balanced in the middle of the recommended range, I had to carry some down elevator trim to fly level. Also the plane exhibited a pronounced pitch sensitivity. I shimmed (two 1/4" washers for a total thickness of 0.123") the back of the top wing to produce about 1.2 degree of negative incidence with respect to the bottom wing. This fixed the pitch sensitivity and I was able to take out the down elevator trim.

FYI, I used the designers measurments for the engine of 1.5 degrees of down thrust and 2.0 degrees of right thrust. These seem to be fine.

The plane is really fun to fly now. Also, knife edge flight is really simple now with no elevator correction needed for very straight flight. Very little down elevator is required for inverted flight.

I like to think of the 1.2 degrees as providing a little stability like tow in on a car provides. Try it, I think you'll like it.

Ken