Sounds like you're over heating the tires. You need to spray them down more and/or drive smoother. If you like to sledge hammer, you might want to go to rivals. yoko or falkens will be as bad or worse than the 71r if over driven.
My last set of 71rs, I ran 36/38 and rotated them every event and...
I was having the same issue at Charlotte was doing 2700ish most of the launches but was just too low. 3K was same deal.
I was dumping and going WOT right at launch it and it would bog more as the boxes got rubbered in.
Everyone was on stones there and we were all 2.0-2.2 60' times
I'd tell them one last chance to correct it or you will do a charge back and leave reviews. Be polite and patient but firm to get what you want. They fucked up and there should be a warranty on the coating that they provide.
Yeah, I didn't feel Dixie was hot enough to spray in there. Bristol will be I'm sure
Dixie was suppose to be the only event I didn't have a co-driver. He's got his panties in a twist over the schedule being ruined this year and bailed. Eased my mind on heat soak, tires, and clutch LOL.
I'd rather turn the engine off but keep the car "On" to keep the fans going.
I've only done 1 Nats event in the car so far and just turned it all off. popped the hood, and doused the Inter cooler after the tires then again at the 3 car warning before closing the hood. (just me...
FP is street legal since its behind the cat. DP needs to have a stock or HFC to be STH legal.
Run XSA/B if your catless and on streeties. Essentially SM but for street tires. New class for 2020
5'11' here and with a helmet on it rubs the headliner. I only notice it while sitting in grid/stagging. Once I'm moving it doesn't bother me. It was more annoying at first but after a few events I got use to it.
So your 4 year old (based on MY release), undesirable model (Not something enthusiasts want and are dime a dozen), average mileage car lost 50% of its value. Seems about right to me. Cars are depreciating assets, never buy one assuming a certain resale.