Transmission Clank

[JT202006]

My transmission issues continue, to date the software has been updated, valve body replaced, and fluid flushed/refilled. The new issue, a clank when shifting from 1st to 2nd this only happens under certain conditions the most notable being. My garage has a slight ramp than flattens out. When i start rolling down the ramp (no gas) in 1st you can see the RPMs climb and feel the car torque/wind up, it then feels like it holds onto 1st too long than jumps into 2nd causing a "clank" sound and small lurch. I've also noticed on cold starts 1st 2nd is usually rough. Any ideas on what this could be, possible torque converter?

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