Did you disassemble the linkage, clean and lubricate it? I think that will fix your problem. When my TPS misbehaved I cleaned both ends of the throttle shaft and disassembled, cleaned, and lubricated the linkage.

The microswitch activates fuel flow startup after deceleration shutoff. The linkage is set up so the microswitch opens before the throttle valve, so their is no "jerk" when fuel flow is resumed. By using the microswitch as a surrogate for the TPS you eliminate this feature and you might notice a slight jerk when opening the throttle after deceleration, but this may be a small price to pay since you must remove the fuel meter and throttle valve to replace the TPS.

I still think that if you "overhaul" the throttle linkage as outlined above you have a good chance of solving the problem and can wire the system back to OE spec.

Duke