Most good PSU's are rated to have a variance of plus or minus 3 to 5 percent. All of yours are well within that spec (the -5V rail is your worst, and it's only 4% out of perfect). As long as the system is stable, don't worry too much about slightly non-optimal voltages. The monitoring system isn't perfect either, so the PSU could be putting out better than you're seeing, or it could be putting out worse. Only way to be sure would be a voltmeter.