I think he means that he put the washers between the engine and the mount. I don't know how, but that's what I understand from your message, cegfamily2.

Anyway, whatever you did, do what SoonerAce described. And, if that's what you did and had no luck, check the wing incidence. That is, if you don't know, the angle that the wing has in degrees to the thrustline. I think that if you had the CG too far back you whould have noticed more bad tendencies

Hope I helped