I expect it also tries to climb strongly when you add throttle too. At least it would try to do so unless you are using a serious amount of downthrust.

The "cure" is to move the CG back and reduce the amount of wing to stab angle often called "decalage". You want to flatten out the wing to stab angle by some amount. This changes the pitch trim too. So that's why you do this change in concert with a shift of the CG. The two are locked together in this relationship. And when done together in the right amounts the stable medium power level flight trim will be the same.

Clearly as it is a trainer you want to have SOME pitch stability to aid in self correcting. But as you're finding out too much of a good thing is still too much. Ease it back using the tests and results posted by Buzzard Bait above to find the happy middle ground.

You'll likely find that you can remove some of the downthrust you likely have as well. Or, if you shim the wing to reduce the wing to stab decalage angle, you'll find that the wing to thrust line angle also reduces. So that would be the easy and effective way to adjust the trim on your model.

Just be aware that when you shim up the wing's trailing edge that you MUST also move the CG. If you don't then you'll just add back in the shim in the form of up trim at the elevator. Reducing the decalage to reduce this pitching sensitivity to gusts has to be done in concert with a shift of the CG to the rear or it's all for nothing and no change will result.