[RocktimusPryme]

I never have any luck with the traditional type of thermostats. I have however had luck with the high flow types. Several companies make them. They run 20-30 bucks but they are much better at opening when they say they open. If you are looking for stability I would start there. Its a relatively cheap swap, and if it doesn't work you can tell yourself that you have that part of the equation controlled so you can move on to other potential issues.

https://www.autozone.com/cooling-hea...E&gclsrc=aw.ds

Something else that made a big difference on mine was AC style pulleys with a smaller WP pulley. I don't feel like that gets talked about much when cooling issues come up, but that was the demon tweak for me.