The incidence between the wings and stab may be slightly negative causing a bit of up trim to be needed. This is not such a bad thing in itself and the plane can fly GREAT that way..... unless the CG or engine thrust is off.

Check the CG first using the dive test. Fly around at about 2/3 throttle or so and get the plane trimmed to fly "hands off" especially on elevator. Then put the plane into about a 45 degree dive and chop the throttle to idle. If the plane begins pulling back up by itself, it is nose heavy. If it keeps going at about the same angle, the CG is good.

Ernie