[Formulabruce]

Originally Posted by mgarblik

My coolant pump is overdriven 23%, factory pulleys. It absolutely has a sweet spot where maximum heat is removed, 2300 engine RPM. 2829 pump speed. Do you know your pump speed ratio?

your numbers are VERY unique to YOUR vehicle cooling capacity, Calorie burn and Area of the heat exchanger tha'ts used ( radiator) .Your "sweet spot" Also has a lot to do with how much air you get across your heat exchanger, and that airs temperature.
I run a A/C pump pulley set up, so my stock pump is slightly overdriven, but it is only a circulator.
I run mine with a AC Delco 170 degree ( static) T-stat.
You might like a 160 .
Sounds like your car is very close to dialed in as best as you can with the Grille.