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I agree that the antifreeze solution is probably not the cause of your overheating. From what I read in your post is looks as if you ran distilled water and WaterWetter for a year. That could be what caused the rust in the cooling system and it could have plugged things up.
If you are having coolant spray on your windshield it is not necessarily an over heating issue. If your radiator cap seals well any coolant hot or cold should go out the overflow tube. Running too full as redmodelt mentioned will cause coolant to be pushed out when warm. Resist adding more coolant as long as the tubes in your radiator are covered.
If you have a head gasket that is allowing gases to escape into the coolant it can push water out the radiator. Often this only happens under acceleration and under load. Check the torque of your head studs.
Have you used a probe type meat thermometer to actually check the temperature of the water to know for sure if it is over heating?