Mystery Solved. I pulled the motor off and checked the screws into the fire wall. All were tight. I then noticed that the compression on the bushings on the top mount were defferent side to side. Photo 1. and Photo 2. I pulled that mount off and the rubber bushings were quite different looking. Photo 3.

The problem was that one of the aluminum bushing centers was short by a tad under 2mm. This gave me a three leg mount and was pulling the top right mount away from the firewall when the motor was locked down tight to the mount legs. There was less compression on the top right, so when I goosed the power there was less resistance to movement.

So, before mounting your Du-bro mount check to see that the eight aluminum spacers are all the same length.

Don