I discovered some interferences between the controls and other structure. The first problem was between the aileron stops on the control sticks (this will ONLY ever be an issue on DUAL controls and TRI-GEAR) and the attach bolts for the tri-gear mains. At extreme forward elevator and extreme aileron, they interfered. I shortened BOTH the aileron stops (not enough to diminish their function in any way) AND the second bolt end DOWN from the top of the spar to eliminate it.
The second problem was that pushrod for the aileron servo for the autopilot was chafing on the elevator pushrod, again, at the extreme (full back elevator) of the range. I put a very slight bow in the aileron servo pushrod to fix this one.