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To the original question, water wetter is intended for people running straight water at the track. It is just a corrosion inhibitor and surfactant that helps reduce problems with running straight water. It really does nothing for a car running coolant, but it doesn't hurt so they are happy to sell it to you. I imagine the other products are the same.
You de-ionized water theory is not sound. The optimum coolant mix for efficiency and anti-boil protection is about 70% water, and in a place like Greece you can certainly run that all year.
Everyone keeps telling you that this car doesn't have cooling capacity issues, so if you want to drop coolant temps you simply need to change thermostats. If you go to low however, your car will never come out of open loop. If you are worried about combustion chamber temps, and oil cooler can only help.
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