If backing off the TV pressure via the tied back lever, changes the 2-3 shift, then, it seems to me, the governor circuit is some how still working. The gov should be eliminated in TFIII, as the shift lever is now the supreme commander, and when you select 3rd, you are not asking, you are commanding! The tied back lever should just affect the shift quality, as in big tire-chirp, or little tire-chirp.
When the gov system is eliminated and the rest of the circuit is repurposed with throttle pressure,AND the normal throttle pressure circuits are also eliminated,then you should have full-manual bang-shifts.
Since adjusting the tie-back, is somehow affecting the shift timing, it seems to me that the throttle pressure is still feeding into it's normal circuit, and fighting the supreme commander.
This leads me to believe that the VB is not set up quite right. Ima guessing there is a fight going on inside, that should not be.If you still have the installation instructions, and a bag of left over parts, I would review the install, and make absolutely sure you didn't miss a step.
