The best operating pressure of a tire is not on the sidewall of a tire. That is the MAXIMUM tire pressure.
For the 12 years that I have owned my Mustang, all of my driving has been done in Minnesota, Wisconsin, and Illinois. 8 of those years have included the winter. Blizzaks are the only thing you can do mechanically that will make a significant difference with your ability to brake on snow and ice. After that, experience is the only other significant factor in braking. The tip about compression braking would fall under the experience category. I wouldn't recommend getting a proportioning valve. That will only give you an opportunity to really mess up your braking ability. Braking is biased to the front for a reason.
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