So I found some amazing info by a professor named Dr. Bruce bugbee
so turns out why people use ambient room temp as a guide is because normally your canopy would be around 3 degrees hotter so let's say at 25° would be 28 or 82.5 or 83 degrees leaf temp every genetic and pheno might react different might tolerate more and you could find out in increments or by accident when the plant shows slight signs of stress but whats interesting is a watered plants leaves will be cooler than one slightly thirsty example: a wet towel left on a counter in the sun will read cooler than a dry towel. So vpd is a start but the most important is plant canopy temp and since you didn't have it correct and even tho they were prob hydrated maybe even too much since the plant couldn't transpire leaf canopy temp was WAY LOW if you want what the video skip to about 30min "leaf temp surface temp"