Thanks for the comments and suggestions.
I did some tinkering and came up with the following modifications (see picture):

1. Slimmed the nose and moved the cockpit further back (where did the name cockpit come from?).
2. Added larger fin area in front of the rudder with fin-tips enclosing the rudder.
3. Increased the tail moment by 10%.
4. Split the fuselage, toward the tail, into 2 booms that rejoin at the tail. This should minimize prop-wash/fuselage interfaction. Comments?
5. Add a double hinged flaperon that is able to more accurately reproduce camber changes and therefore increase efficiency when there are large deflections. Also, the flaperon allows for take-off flaps that might be needed since the bottom fin keeps the tail high off the runway.
6. Retracting gear the folds backwards into the underside of the fuselage.

What aerodynamic factors (positive and negative) have I change/introduced by making these changes?