The default setting comes at maximum. But I was wondering what's against leaving at max for best protection of Prevx processes? Might it cause slowdown, or possible conflict with new app installs, perhaps? I've had mine set at max for about a month now, and think I might leave that way, since I don't see any conflicts, or issues to persuade me otherwise. + https://www.wilderssecurity.com/showpost.php?p=1731072&postcount=5
Having it at max might in a few cases cause stability issues with other security applications. That being said, it's very uncommon to see stability issues even when the setting is at maximum self protection. As long as you don't experience any problematic issues, leave it at maximum self protection.
Mine is at max. too without any issues. However I recall that I have had an issue with another software interfering with Prevx (sorry but I don't remember it exactly) and Joe advised me to lower the self protection what did the trick. Next build contained a fix so since then no problems encountered. I am saying this to remind you if you get to compatibility problems try to lower the self protection at first.