Straight HotA is pretty easy to play, specially with a fury generator.
You've been running hybrid DT HotA and the only difference is that you drop WW and add Rend because you'll be constantly in close combat.
Maybe a little more critical hit chance would be in order, HotA is all about crits. Your attack speed is already high enough to perma WotB once you learn how to manage alternating strikes between Bash and HotA.
To try, I'd suggest this:http://us.battle.net/d3/en/calculator/barbarian#ZaUcRP!YZd!YbbZYcThunderstrike
over Smash because it has a bigger area of effect and lets you chain stun mobs.
High attack speed along with Punish
will let you fuel your fury fast and grant additional damage.Marathon
is for the efficiency. I can't play without running these days.Bloodlust
is your healing tool. A -Rend IK belt is cheap and will help with your fury.Bloodthirst
is there because you seem to need LS. If you don't, feel free to get a different passive, such as Animosity (+20 fury = +4% HotA crit chance).