If this is a really strong tendency then it implies that you are running with a degree of pitch stability. To confirm this I would try setting it into a trimmed slow speed level cruise that does not require any back pressure on the stick. Then push it into a 30 degree dive and let the elevator stick return to neutral. If it srongly noses back up then you are flying with a high degree of pitch stability. If it pulls back up but slowly then that is about right. For a model of this sort it should not want to keep going straight or try to tuck to a steeper dive.

If it pulls up strongly and you want to cut down on this then the correction is to move the CG back a little, retrim the elevator and try this same test again. Keep fudging it back and re-trimming until it has a reliable but slow pullout on it's own. A good setting for a model of this size and type would be for it to lift the nose to level from a 30 to 40 degree dive in about 80 to 100 feet of altitude from the time you neutralize the elevator stick. From there you can counter some of the tendency to climb and dive due to throttle by adding some more downthrust. But it's best to get the CG correct first and then use only enough downthrust to make the climb and dive tendency managable. You really don't want to get rid of all of this since the tendency to climb with increased power is very normal and very scale like. You just don't want to have to deal with too much of it.


As for positive incidence in the stabilizer this means nothing at all. It's only positive to some imaginary center line. What really counts is the angle between the wing and the tail. As long as the wing is positive compared to the stabilizer all is right with the world. The rest is just smoke and mirrors.