ORIGINAL: Tall Paul
With a "lifting tail", the plane becomes a one-speed airplane. It will be trimmed at one speed. To get that trim.. very little elevator deflection, the c.g. will need to go aft.
It's basically a low wing Telemaster.
Or would be a low wing Telemaster if the main wing's airfoil wasn't symmetrical. That throws off the relationship between the wing and tail as compared to the Telemaster. With the Telemaster, as speed increases and the tail rises, so does the wing, since it's also strongly cambered. No so with chris's model, because as speed increases with it, the main wing doesn't experience as much of a lift increase in proportion to the tail, hence the 15-18 clicks of up-trim needed. Also, raising the thrust angle effectively moved the CG aft under power and that made the problem worse. I would want to know the tail volume, etc, before I moved the CG back much on this particular model, knowing only that the tail has positive camber. It might work fine, but it would be a lucky guess at this point.