I see where you're coming from about the Water Wetter. But to me, the fact that Red Line is a reputable brand of highly regarded performance and racing lubricants gives them a lot of credibility. If Water Wetter were made & sold by, say, Slick 50 then I'd probably ignore their claims entirely. But Red Line makes good stuff, hence my tendency to believe their claims (which are pretty reasonable, and not outlandish).
I'll keep mute on the cooling problem for now, until the original poster (who never gave his name, so I don't know how else to refer to him) replies with some new information. If he's still reading the thread, that is.