I bent the hell out of the hooks so they almost do an immediate 180* and I wear the IE600 at more of a diagonal angle than it's displayed in pics (or so I think, haven't taken a pic of me wearing it). That makes the stock cable much more bearable for me and overall the comfort is still great. I've been looking for a modular cable (multiple end terminations) that fits the IE600 without dropping like $300+ on some boutique cable.

The IE300, 600 and 900 all have the same recessed MMCX connection so a normal MMCX cable usually won't fit properly (even that it may work). I've heard of some people taking the red and blue circles off the end of a normal MMCX which basically makes it recessed but I wouldn't risk that on anything other than a cheap budget cable.

There are budget IE300/600/900 cables on Ebay and Ali Express for like $20 as long as you aren't looking for modular.