2020 C8 trans issues after PCM unlock

guys,

have a weird issue at race track with a cammed/headed LT2. Engine drives great and has good power but at track it happens often that it shows "acceleration limited - drive save", the modern way of REP. No MIL codes visible

Often it shows up when you brake hard into a turn, shift down but it suddenly automatically shifts up 2 gears and you can not change gears anymore until you stop and restart - or- even more strange, it shifts by itself at 6800 but PCM rev limiter is set at 6600.

in that case it should bump into rev limiter first.

somehow it feels that TCM sometimes no longer sees engine rpm correctly and does funny things. It does not do anything strange when you shift around 6000-6200, but WOT and higher then that it acts up. Not happening on street either

mods are cam, ported heads, headers, 103mm TB, Trinity intake - but stock cats

anybody experienced anything similar?Attachment 145625