I only use regular old antifreeze and distilled water. I found that the other stuff really isn't a contributing factor to keeping my engine cool. A properly tuned engine in good shape will stay cool if you keep air flowing through the radiator. When riding with still air at the dunes my 391 stays at 185°f, going against the wind it is around 145°f, and riding with the wind I have seen it hit 200°f. Not enough air flow when riding with the wind especially when the wind is 25+mph. Vary your direction and keep the air moving.
Loren