You remember if that OSG was coated or not? I've used regular osg form taps in SS and they get really hot, but the xpf line meant for harder materials are TiCN coated and have pseudo flutes in them and I've noticed they don't get nearly as hot.
Anything that I have here like that is TICN.
Doo folks offer uncoated tools anymore? (from stock)
The tool from Jarvis that I used was 20 yrs old or more, and was TiN only.
I have noticed the OSG taps being hot anytime that I run a 304 part (very low volume).
But the one time that I tossed the Jarvis in, it was cool.
Cannot say for sure that the next time with a new tool would be the same, but...