I have a ir temp gun aswell, i will watch a few videos ....
my m8 who has a closed loop says his oven is on 30c, he also says it takes about 3-4 days before his shatter starts to turn like mine does after 3 hours
I no he makes very clean dabs and cuts no corners where as i cut loads i have taken him a bit of mine up to try see what he thinks and get sum honest feed back from sumone who nos what they talking about
Plenty of videos on YOUTUBE of doing vac chambers and using IR temp gun for making sure of temps but from memory I can’t think of temps to not exceed but it’s definitely higher than 28/30C.