Hi
I have been through this recently with my Super Sixty(40 power). I had to reduce the wing incidence and move the cg forward a little to make it fly reasonably. Flight path was only comfortable at the mid range throttle setting and in fairly calm conditions.
However I finally decided to use a spare symetrical wing I had and modified the fuselage and set the wing at 1 deg incidence. I added 2deg downthrust and moved the cg a little forward from the theoretical position. This machine is now much better and flies really well, even in windy conditions and is much more responsive. No elevator trim neccessary.
Hope your mods are as successfull.