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I read the first page and was going to post basically what redpoint5 posted.
Water has a fantastic combination of thermal conductivity, heat capacity, and low viscosity. The reasons I can see for additives are:
1. A detergent, to help remove bubbles
2. An anti-corrosive
3. To raise or lower the boiling and freezing point
Antifreeze, generally speaking, is less effective as a coolant than water. It is used because it has the important properties of inhibiting corrosion and lowering the freezing point.
I'm willing to bet that the radiator/air is your bottleneck though, and not the coolant. You might try replacing the radiator with something more conductive, such as copper or silver, but you'll then need to keep an anti-corrosive in your coolant because of mixed metals.
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