top tuner - Having lubed your slide seals and gears, you might investigate this:
There probably is a little slide relay control circuit board mounted in the bedroom sink cabinet, mounted in the upper left corner of the cabinet. If you remove the cover you will find the control circuit board. A connector with about 6 or 7 wires can be removed to release the circuit board. If you slightly crimp the female pins on the black and red wires...the ones that go to the motor...you can get a better connection and possible decrease the resistance to the motor leads, increasing the current and enabling the motor to perform better.
I had the same problem as you several years ago and this resolved the issue.
Additionally, check the wire splices at the motor itself. Another problem that just developed in mine last weekend was one of the splices worked loose and would not allow enough current to the motor...causing the same symptoms as before. I re-spliced one of the leads to correct the problem. Your splices may need to be re-crimped or replaced also.
'01 Alpine 36 FDDS