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Keep in mind the other aspects of a cooling system. No point in raising the boiling temperature to levels that you engine is already damaged at. Also keep in mind increasing boiling point or any temperature will increase system pressure so you are still at factory limits unless a high psi cap is used.
For the most part the glycol or coolant is mostly for corrosion protection. While it does help with temperature properties so does a pressurised system so they work hand in hand. The coolant, water or even the "waterless" coolant is only a median to carry the heat to the heat exchanger. At best you might get 12 degrees differential across a radiator. So if any other part of the system is not coping it is not really the coolant at fault.
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