If you go PP1 go 2020+ to get all of the S550 tweaks including the better version of the mt82 transmission. I've tracked mine and never had an issue with overheating even in July in Texas @ COTA.
Is the intake system stock? Have you tightened all of the connectors / clamps between the filter and the throttle body? I had a P0300 on the track that turned out to be the engine flexing on the motor mounts under heavy braking that was kinking the intake hose and letting in un-metered air and...
Have you seen this thread? If you didn't reprogram the gear ratios that could be an issue but this is only a guess
https://www.mustang6g.com/forums/threads/tremec-3160-swap-in-a-18-gt-base.187942/#post-3905382
Have you checked all of the clamps for the intake and cleaned the MAF sensor? I had similar code pop up at the track under heavy braking and it turned out under deceleration the intake tubing would compress as the motor rocked forward allowing a gap in the intake for un-metered air to get in and...
Ford dealership service departments are notoriously horrible so I'd recommend finding a local mechanic you trust nearby moving forward. It sounds like you have a couple of things that need checking. The rear brakes require you to reset them when changing the brakes and this is a common oversight...
What's your plan if you snap your axles? I'd probably consider swapping in GT350 axles for insurance and I'd also buy some new drag radials to fully enjoy the next session. Good luck.
P061A is tire size or vacuum leaks in the intake system. Another poster here has also recently shared that he was using a cheap amazon phone USB charger plugged into his Mustang that was causing the issue as well so check for any accessories that you have plugged in.
Went to my first track day and had a blast - it was the perfect opportunity to begin to find the limits of the s550 platform. The car performed admirably! The first thing I ran into was a flickering CEL after a very hard braking zone - it didn't recur in that session but became a solid CEL in...