The small signs of clutch slippage showing up on a few logs...
Top graph, black line, highlighted... RPM's don't irregularly ramp up erratically in this fashion after catching traction.
This is 2nd gear of that 12.73 run.

My 2 conclusions:
1) Southbend Stage 4 Dual Ferramic sucks
2) Steering rack leak can be making it's way in there making this slip as it's not a repeatable event
My Course of action in the meantime:
Drive it until it's fully worn cuz there's no way in hell I'm dropping the tranny to replace the rack only to find out that IT wasn't the cause... So I'll be enjoying it at it's current tune, work on my launch and shifting until clutch replacement time. At that point I'll do both rack and clutch.