Jiggle it side to side.
You think i haven't tried that already? I've watched a good 3 hours of videos and like 9 different guides.
You didn't say you checked any guides only that you'd tried various tools at your disposal.
If you only give half the story you can't blame me for pointing you in the direction of some tips on how to do it.
I tried every trick in the book all to no avail, eventually bought a Pulse Modding ATX pin remover from the bay and they all came out straight away!
I don't know, my Corsair PSU's have always been like this, really snug when you first install them, after a few rebuilds, their looser if you know what I mean.
Hope you're sorted soon mate!