I can see now how IAT2 can be an issue. Cold this am, <50*, but after a 20min easy drive to work mine was 105* and while I sat there letting the turbos cool a bit before shutdown(habit from old days), I watched the IAT2 climb 2-3* per minute just at idle..
I did notice the temps drop when the car is moving, but staging in staging lines could make for a really hot IAT temp before you get to the line to start. Cooler temps from moving air not hit until you were 1/4 way down track likely and by then you got boost heat coming in hard anyway so too little to late...
Got me wondering... Maybe some sort of supplemental small fan to mount on the Intercooler up front that could even be set to run when the car is off? No air going thru it at that point, but cooler get the metal intercooler, the better and worst case forcing air thru at idle keeping it from just heat soaking?