At the risk of playing devil's advocate here (I tend to stay away from cable discussions), here's a wild-card. If you want a light weight, easily coiled cable, have you thought about using "starquad"? Although this is designed for single channel use where you need to minimize hum pickup in situations with a lot of electrical noise, it has 4 cores + screen & I've found it to work very well for running a stereo pair some distance back to the recorder. Because of the balanced configuration of the mics/recorder and the fact that the two internal cable pairs are fixed at 90 degrees to each other, the crosstalk is minimized.
I regularly use long lengths of Van Damme starquad for nature recording, where I need to be able to quickly unwind/rewind cable, often in difficult low light conditions, without it tangling or kinking.
I terminate each end with 5 pin XLRs according to the standard "stereo mic" pinout. (For one channel use the blue pair, for the other, the white.) Then I have Y adaptors which are used each end to splay out the cable to 3 pin XLRs. With this configuration it's possible to daisy-chain lenghts together to get where you want without having to carry unnecessary amounts of cable. This way there's no issue with having to split cables into heatshrink/techflex, etc. either.
Good starquad (Mogami/Canare/VanDamme/...) is tough &, because all the conductors are bound together it resists kinking when tugged hard. It's also lighter weight than (most) snakes which are bound in pairs.
The only concern would seem to be inter-channel crosstalk. Rather than attempt to model the cable & calculate this, I did a simple empirical test with an AT mic & Tascam DR100-III.
For 100m reel (wound) Van Damme "Tour grade XKE quad cable":
At 1kHz, crosstalk -91.9dB
At 10kHz, crosstalk -80.1dB.
Which is impressive by any standards: this is a whole drum of cable, after all! It also gives real world meaning to the advantages of balanced audio:)