Responses to questions:
The cables do not cross and they are approximately 32" in length.
The elevator and rudder horns are on their respectivehinge lines.
The servos are new Hitec 5625 digitals.
The paired cable lengthsdo not vary more than .062 to.125" of each other.

The control surfaces (rudder and elevator) do return to neutral when I manually return the radio gimbal sticks to center, but I see the issue when I simply release the gimbals from a deflected position and hope that they center. I think that I can live with the situation, but won't really know until some flight time. This is on the ESM74" Corsair.