I read about this cocktail years ago, here in COG. It does work. Thanks Steve.
It's not practical to perform annual coolant changes on most bikes.
I don't have access to DI water, nuclear reactors or whatever, but I do have access to distilled water and a motorcycle that's really easy to swap coolant.
I run this "cocktail" at 25% with 10% Water Wetter in my KTM 990, a v-twin that's prone to run on the hot side, on single track.
It's a bike that's prone to corrosion/erosion in the water pump cavity caused by old, contaminated coolant.
I do mostly <20mph trails, 80 to 50deg F. This cocktail allows cooler running with minimal airflow and my single cooling fan cycles on and off vs being on constantly.
I change the coolant, 2.1 liters, annually.
Many 990 riders mount an aux fan and a 190 vs 210deg fan thermo switch. I run the stock, single fan/210deg system.