Diablo 3: Question about alternative gear choices

There's a reason every T10 farming build works in gold wrap; between Avarice band and BotH, there is always gold, and gold = speed. So when you throw in gold wrap, gold ALSO = toughness. So much toughness that you can sacrifice toughness rolls on all your other gear, because you're running around with hundreds of thousands of armor. Which means more dps across your gear. By dropping gold wrap, you need to have a lot more toughness on the rest of your gear. Basically, that one affix boosts your DPS indirectly by meeting all your toughness needs.

Secondly, any build that relies on hitting a CDR breakpoint to keep a buff up all the time (like any Dawn-cubing DH or Boomsader) should have a diamond in the helm. If you hit the breakpoint without the diamond, roll CDR off your gear. The diamond is nonnegotiable. CDR stacks multiplicatively, so that 12.5% is a better investment than two 6% rolls (which could be a Crit stat, AD or IAS). Besides, the only other worthwhile gem is the Amethyst, and you don't need anymore toughness.

Thirdly, almost every speed running build wants Nemesis bracers and Warzechian Wristguards. Wear one and cube the other, unless your build has some really specific items that outweigh more progress orbs and faster movement speed. (As an aside, if you're a UE DH with hatred problems, you aren't doing enough damage, but feel free to fill in with a Cidercoat or Pride's Fall while you wait for some ancients) Ditch the Custerians, they stop being worthwhile long before you can speed run T10; even if you gain 100M gold in a rift (which you probably won't), that barely dents a paragon level past 600 and you'd get more running GRifts anyway.

Look, play the game your way, but gold wrap's one stop toughness sink is pretty much what makes speed running viable. I've used the exact build you've linked for awhile now and my average clear time is 2.5 minutes, depending on the rift, with half ancients.