You might try something like this:
Tal6/FB4 bonuses w/ Blur, Unity, Halo / APD, Esoteric for some added defense.
Keep FN:Mists on autocast and Use the ranslor's pull to help proc apds better. Most of the rift will just be using Teleport and channeling AT:SD. Just make sure to manually recast the Fire Twister if your stacks drop.
You can also swap out Ranslors for Mantle of Channeling or Goldwrap. Goldwrap would probably be better swap now that I think on it, since you'd be able to tank moltens in TX.
Edit: I don't think etched sigil casts proc area damage, so feel free to replace that stat... forgot about it when putting together =).
Other edit: once you get to clearing TX fast, swap out APD / Halo for something like Avarice band,and use both ranslor's and goldwrap.
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Short of giving the inflated level 20 characters legitimately good sets of gear, cube included, they'd still just get crushed. I think that they'd need to create an alter mode, similar to story and adventure, PvP mode where across the boards the item scalings are different.
I do like the idea of scaling stats back but I'm not sure why people are calling for PvP "balance" in reference to previous Diablo titles. Diablo 2 was suuuuper imba in PvP and most kills were 1 shots, lol.