Helm: 2sin/20cast/99% AR per lvl, preferably 2 sockets, but 1 is fine
Amulet: Highlord's
Armor: Enigma
Claw1: Chaos Suwayyah, ofc.
Claw2: Feral's Fool's (2soc, UmUm)
Gloves: Trangs
Belt: Arach's
Ring1: Raven's (high ar)
Ring2: high ar, stats (mostly life).
Boots: Gores (non-upped)
Charms: AR / life. Ar/Dmg/Life if you can.
There is no "or use fade". Use it, definitely. You can't afford to lose your mobility, and the stuff that you ignore to keep it has the DR. Fade is maxed, and you have plenty of + skills. Ber'd circ gets you ~50 if your claws have + fade (still close if you cast just on BO side).
Unfortunately, there's much more to it than WWing away. It kills smiters and the like easily, but not WWers.
Mostly, they telestomp. As a barb, it's very tempting to assume the sin can't kill you first. Here's where you WW away. Make sure it's truly randomly done and isn't where he goes. Never trade whirls. If you do the trapping and MB, be ready to halt quickly if he's teleporting. WW medium and tele off.
If you're attacking him, get behind his WW and off to the side. Intersect him, meeting just behind the char, not before. Keep the Shadow and CoS up at all times.
If he WWs directly to you, WW perpendicular. If that follows, tele and flee--he's about to hit you and get out of desync. Lead him to where he goes directly to you and repeat direct strategy.
Most importantly, watch
this and see if you can view what I'm talking about. It makes it clearer. Ultimately, it's a much higher learning curve than any other fight, so expect to lose. Even great sins aren't perfectly consistent, but do deliver nasty surprises. Don't play to ****--you never will. Just have fun with it.