From what I hear, the Lucas oil stuff works for a week or two then bogs down again. Most likely that would be caused by clogged strainers in the valve body. Compu If I were you I'd drop the valve body when you change out the filter/fluid (said it was overfilled anyways, which won't help) and make sure everything is clean and intact. Your problem certainly could be caused by fluid blockage within, worth a check. It is worth not having to buy a new transmission or having to replace the B3...you'd at least have peace of mind.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth