Atx pin problems

Hello all,

Not going to lie, I'm getting very frustrated. I have an XFX 850w PSU and I'm trying to sleeve the individual 24pin atx cables... to no avail. My sleeving is supposed to arrive any day, but I thought I'd get a head start de-pinning the cable. I started with an extra 6+2 PCIe power cable... and well, I've tried everything but nothing seems to be pushing the pins in. Is there something I'm missing? Does XFX use atx pins that aren't standard? I've already broken one tool and tried the double staple method.

I would really appreciate any advice. Thanks,
Shawn