Thats not the way to correct the problem Jock. You can either correct it by changing the CG or increasing positive wing incidence so that the plane requires less up elevator trim or a little down elevator trim to fly level I believe. I Think
www.nsrca.org has a trimchart. Follow it in order and you should be able to correct it without screwing up all of the other trim characteristics. MAybe someone else will comment now that I have messed you all up!
Mike