If incidence is the problem then leading edge up, an easy way to remember this is hold the wing level and decide what you need to do Ie; to move the nose down put a shim under the leading edge. Before you change the incidence I would first look at your balance. Depending on the level of the pilot it should balance level to slightly nose down at the mfgs. reccomended CG point with no fuel. Also look at the design, the old Midwest Aerostars and Stiks looked like they were flying tail low due to the horizontal stab being on the bottom of a downward tapered tail.