Yes, the transmission was slipping during upshifts, and may have been cutting throttle as well in response…the transmission failed on the way home and was replaced a few weeks later…

Ridge Motorsports Park
1:46.58 (and a couple fun moments at the end)
C8 1LT Z51
The upshifts seem delayed/bobbly in the lap, and the trans had some issues after, so hopefully that is fixed next time.

TC and ESC OFF
OEM PS4S runflats (245 front and 305 rear)
MCS 2-way non-remote coilovers 
  set at OEM ride heights
Girodisc replacement rotors
Carbotech XP12 track pads

Twas the first day of tracking the C8 after a single wet near freezing session a couple weeks ago (which resulted in much dissatisfaction and subsequent whining).

I left some margin in a couple places as the PS4S on this car are really on the limit in places where you typically aren’t in most cars and with actual track tires. So much fun though!