Sign me up as one of the people who won't miss UVLS at all. I -may- still use it if I coin a HTF version of it (got 1 more week since I cleared ToT this week already! You never know), but as is, I'm promptly DEing my normal one first thing on patch day.
I feel like 9778 Haste + 12-13k Mastery is the setup to go for starters at a 545-550 ilvl - I think lowering Mastery below 10k (which you would have to do if you went for the 13157 Haste cap) would be less benefitial on the long run, rather than a extra tick on the 3 dots. Some simcrafting on this would be nifty.
About what threshold to reach after SoO, I think staying at the 13157 Haste cap would be best - I'd have to calculate full HWF gear, the next reachable threshold would be 18207 (for the extra tick on all dots) and it'd depend mostly on how much Mastery you'd be able to sustain with that.