Look at it this way Michael, no matter what you do, the wing will fly at an angle to the apparent airstream just so that it exactly makes just enough lift to keep the plane in the air, fly slower it will need to be at a greater angle, fly faster it will need to be at a lesser angle. So, first decide what speed you mostly fly at. Look at the way the fuselage looks. Do you now want to 'lift the tail up?' Then you must adjust the angle of the fuselage to the wing so that with the wing held still the tail raises, you will see now a gap between the front of the wing and the fuselage (high wing). Fit a packer to maintain this angle. Unfortunately this also changes the angle between the wing and tailplane, the 'speed trim' of your model. You must now return this angular difference to what it previously was. There are two ways, one, by re building the tailplane angle to match the previous set up, which will involve some surgery to the fuselage, or do what most of us do, re-trim the flying bit (elevator trim) so that aerodynamically the effect is the same. This will likely involve a bit of down trim. You will notice that there is no need, or requirement, to alter the balance of the model. And in fact you should not, assuming that you are happy with the balance as it is.
Evan, WB #12.