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Cheers for that woz! That link you provided will be a great help, I didn't even know it was possible to test the solenoids that way. I'm going to try and get a used zf6 hopefully this week as it seems a bit tricky to get just a torque converter as no one wants to part it from the box which is understandable. I'm pretty sure I can just chuck my old TCM in the new one and reset the learning tables in FORscan and it should hopefully all work. Going uphill the other day I did get some gentle shuddering so I'm leaning towards torque converter. At least when I go to swap the TCM I can test the solenoids with a multimeter then. I was quoted around $1500 in parts for the sonnax zip kit, new solenoids and a few other goodies but hopefully the valve body is still half alright as I don't really want to spend too much more on this car. Thanks again for the advice and link, I'll definitely keep y'all updated on how it goes

If you have forscan and a compatible obd cable, you can see what the torque convertor lockup solenoid is doing and the amount of slip the convertor has. A lot of the time there are no faults associated with a torque convertor that is surging. Worse case scenario you need to pull the box out and replace it, at least they're quite common these days. You could try replacing the EDS6 TCC solenoid if you feel like doing some shotgun troubleshooting. https://www.sonnax.com/tech_resources/308-zf6hp26-solenoid-identification