You guys are reading far too much into all this I think. Setting the wing and tail at 0-0 is still the best option for a pure stunting design. It ensures that the model will fly the same way both upright and inverted. There's nothing wrong with the fuselage flying at a degree or three positive angle. The real key is how it responds in a dive test. For something like your Cap you want to be able to push it into a vertical dive at about 1/4 throttle and have it stay in the vertical or only very slightly try to pull up. Then play with more or less power and adjust the downthrust so it works the same way from idle to full bore. Now THAT will be a truly neutral handling model. At that point there should not be much elevator trim at all.

I'll leave it to the pattern and TOC style flyers to tell you if it's the desireable setup or not.

Also, do not confuse a lifting stab with stab lift or a stab with a symetrical airfoil as being a lifting stab. A lifting stab has a cambered airfoil but any stab can lift if it has an angle of attack to the oncoming air. An airfoiled stab is not always a lifting stab.

Confused yet?