Yep I'd start with a 50/50 mix. Should actually cool better that way too. No telling what is happening chemically at that mixture. A 50/50 mix actually has about 35% more heat transfer abilities than pure anti-freeze, the freezing point is also lower with 50% water added.
Bear in mind, the water is not just there to dilute the antifreeze, there are chemical changes that take place in the Ethylene Glycol when mixed with water. Water produces vapor when heated that pressurizes the system, and condenses when the engine cools drawing down that pressure. Who know how pure anti-freeze behaves in the same cycle ... might expand and contract totally different than a 50/50 mix.
Almost sounds like there is somehow electrolysis taking place in the engine producing gasses. Is your battery by any chance going dead? Do you have any unusual electrical device attached to the engine? Maybe an electric temp gauge hooked up wrong that is shorting to the coolant or something of that nature?
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