Thats one reason I'm going with Evans waterless coolant, to reduce the pressure on the entire system to help prolong and prevent future pressure related problems. Not only hoses, but head, intake and other gaskets as well.
Here's the part I don't get. If folks are willing to run up to 80%
antifreeze coolant and a mix of water, why not just cut to the chase and run what is essentially 100%
antifreeze coolant? Think about it, your 80% there already, the additional 20% (water) now demands that special additives for corrosion are included in the base stock (
antifreeze). Those additives will dissipate over a given time frame and have to be replaced or the entire fluid changed out. This is a no brainer, in my opinion, you have three choices.
1. Water and additives like water water wetter, a good mix for maximum coolant heat exchange.
2. Water and antifreeze mix, less heat transfer ability than straight water but it covers you for winter freeze up conditions.
3. Waterless coolant, about the same heat capacity as a mix, no additives so it doesn't need periodic replacement and provides freeze and boil over protection far beyond any pressure capped "mixed coolants" could hope to provide. 370 degree boiling point at ZERO pressure.