Are you aware is there some kind of protection build in those PSU's. They are running smoothly at the moment. No extra heat or other kind of visual problems.
Is it screaming like a banshee? When I measured the current draw on a 245v line with one 741, it was pulling > 1200 watts of power. Granted, it may not be a 100% accurate measurement.
Maybe they are designed for abuse?
I can't tolerate the noise when they are at 105% capacity, so I went with two PSUs to three 741s.
M