Cooling System Additive

I'm TELLIN ya. This is the SIMPLE answer, although it may prove difficult to fix.

ADDITIONAL PRODUCTS I don't care the brand, type, or purpose, are NOT going to have a significant effect on cooling. You need to figure out what is wrong with the cooling system and FIX it.

I agree.
I use a qt of antifreeze for corrosion and pump lube. Car sees a lot of strip time and if I ever blow a hose I don't want to be the person that ruined the track prep for the day.