Cooling System Additive

There are strongly held opinions here so i'm not sure my input will be worth much but as a person who worked for a heat exchanger manufacturer for over 20 years, I can say with certainty that pure water will perform the best. I have no experience with 'water wetter' so I will concede it may provide an improvement. A 50/50 EG water mix required the heat exchangers we made to have 3% more surface area for the same performance as straight water. Straight water, however, will corrode iron and the rust layer will quickly degrade efficiency. So, the small reduction of thermal performance from using automotive antifreeze is a small price to pay for freeze/corrosion/pump seal protection.
Incidently, Ethylene glycol ls highly corrosive- more so than water. It is the additives that quell it's corrosiveness and provide lubrication. Back in the 'old days' you could add a small can of a rust preventative product to straight water that would keep the water crystal clear but these products (containing chromates) have been banned for over 50 years as hazardous to the enviroment. I've not heard of a suitable replacement.
I'm with 67Dart273. Find/fix the real problem. Collapsing lower hose? Bad thermostat? Damaged water pump?