What don't you like about the handling under the power with the outboard as it is?
The problem is the total lack of predictability and control when trying to back her up under power. The current configuration is shown here:
Obviously sailboats were never meant to go backwards, and with a full keel configuration (about 3900 lbs total displacement on 16 ft of waterline), such designs never do well in reverse, but it seems the prop wash hitting the rudder must disrupt the flow over the rudder that would offer some steerage and push the hull away. Also, because of the motor always being in the water, the drag effects the performance under sail especially on port tack where she carries a significant amount of lee helm. So, it seemed that the solution(s) might be to get the motor further away from the rudder for improving performance under power and getting it out of the water when under sail, hence the idea of the mount.
I am very open-minded and have little experience with this, so all thoughts and suggestions appreciated..