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Try shimming the horizontal stabilizer up in the rear 1/32" and then retrim the plane. That should help and you may have to add more shims. I hope this helps.

Check your stab tilt for turn under power. If looking from the rear of your plane, the left side of the horizontal stabilizer should be higher than the right side. If it starts to turn right on decent, Check that your tail boom is straight and that your wings have no warps or twist in them. Good ...