Somewhere on this site there was a retired bearing engineer that probably forgot more about high tolerance bearings than all of us combined currently know. I can't recall his screen name as it has been probably at least 3 years since I have been to this site but I will see if I can track down his posts on this very topic and report back. Or you can search for bearing preload or angular contact bearing - you might stumble across his posts. It would be worth your time.
Scott
Consistency is a good thing....unless you're consistently an idiot.