Scott ScottM,
Here is a picture of a my '89 at rest.
It's a big jpg
http://www.revcmpsys.com/fishing/picts/boat/1.JPG
Notice that it has a pretty big top on it too.
It sits with the nose slightly up. Is there a possibility that when your boat was
made, it had the gas tank installed more to the bow to compensate for the 2 motors?
When you went to the single motor, maybe it is out of balance.
The other possibility might be water in the bow (oh oh). Where are your batteries
mounted? Mine are in the back. Do you keep your anchor up front.
Let me know what you find out