Run a product called "Engine ICE" instead of adding water wetter. It is a coolant replacement used in motorcycles and snowmobiles and in my experience works better.
If you are using the Performance wheel, after doing the coolant replacement or adding water wetter use the wheel function to monitor your coolant temps. Gauges = information, and information in this type of diagnosis is crucial of course.
Keep in mind engine oil and coolant both transfer heat from the engine..upgrading both items in a track use car is essential to longevity as well as performance.
In some conditions the air density is so low that even charge cooling does not do the trick 100% and meth is a great solution to cooling the IATs. In hot humid climates is when you have this type of scenario.