Try using adb shell whilst the watch is active rather than TWRP, I think I gave up on TWRP too for that very reason. Sorry my blurb wasn't specific, I was amazed I got it to work through experimentationFollowed all your steps and they all executed fine (format was successful, etc.) but TWRP refuses to mount /cache, even after a reboot. Doesn't appear under mounts, either.
And trying to boot the system, I get the boot animation for a good 20 minutes then gave up...
Changed it back to ext4 and it booted straight back up no issues...
Running the latest multi (not wifi.) kernel and v3.1 of the Urbane ROM.
Doesn't seem to like F2FS for me - nevermind!
Was only experimenting!

Edit:
Pretty sure I converted one without mounting either!
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