I wouldn't trust an IR thermometer for taking tire temps at all, pyrometer with a probe is the way to go. The outer surface you're measuring with IR is going to cool very quickly esp in those temps while you're parking, getting out and checking.
Understood, I never updated this thread, but I checked the temps after getting back to the pits several times and I'm pretty sure we never eclipsed 100 degrees. Most of the day I took readings in the high 80s-90 degree range (surface temps with the IR)
Despite that the car still pulled 1.1G regularly on almost every lap, and peaked at 1.2Gs briefly, early in the day, and this track only has one high speed banked corner, the rest are pretty flat or off camber.
So I guess the point is, I wanted to give the feedback that R-Comps aren't useless in colder weather. They do have less traction, and that was apparent, but they were still better than the cars on street tires there, which were also being impacted by the weather.
I also was surprised by the number of times the car sustained those lateral grip figures, I didn't get the sense that we were pulling those numbers especially in some of the slower corners (one in particular that is perpetually in the shade) And all of the rubber picked up that day was on the outer edge of the tires (And I have more than -2 degrees camber on all corners), so the softness of the springs wasn't helping my tires wear even but it was probably helping total grip. I put a front sway bar on the car and did an AutoX the next weekend and it was terrible, car pushed absolutely everywhere.
Some videos from a couple of the faster laps towards the end of the day, when it was actually cooling down (high 30s/low 40s):