Hi Jim,
I'm giving up on the theory and hypothetical here as it seems a little pointless.

On the more practical side I suggest you try adding some sub-fin for a test or two. With more sub-fin less right thrust should also be req'd. If you do let us know the outcome and if it works we can discuss why. The three S's come to mind
Also/alternately, though it is a single prop set up, try a flare on the rudder TE.
I believe the fin design on the Nuance is inadequate to begin with !!!!!!!

Brian