Figured I'd throw an update, since you helped me out. I did the mod, I'm kinda garbage at soldering, but managed to get it done, even if it wasn't pretty and I trashed 2 of the mmcx connectors in the process (luckily i bought extras). Managed to get it done, not entirely perfect, even with the exact mmcx connectors, locking washer on the outside, trimmed down the center post a ton, the cups still kinda touch the mmcx, but i managed to get them screwed in, and everythings in place now. Currently listening to them, and as soon as I had them back I decided it was time to significantly upgrade my setup, and I bought a thx amp, the monoprice one with the built in dac, since all others are out of stock until late november, and I figured I'll decide by then if I want to swap to the new 887 unit, or keep this one. Gonna be hard to get rid of this, even to swap it for an updated model+standalone dac (eyeing that SU-8).... Either way, I got these hooked up right now with a balanced cable and I swear it's like I just got these fostex for the first time, so happy I got off my ass and finally fixed the cable, thanks for helping with that.
Now I'm just waiting on this drop to get delivered, got into town early this morning but fedex I guess decided they didn't wanna deliver them today. Still says expected delivery date of saturday, so I really hope they don't just sit on them for 5 days... I already got a balanced cable for the senns and everything.
Anyways, thanks again, wouldn't have picked up this amp if I didn't get around to fixing the fostex cans, and this thing is game changing.