You can try changing your starting sequence:
Thunderclap to get the initial aggro, when all is clustered up hit shockwave and rend right afterwards followed by another thunderclap. And mark a focus target you can work on harder and just taunt back when your dps pull aggro of it.
Specc: you might want to grab 2/2 Heavy Repercussions, it's an awesome single target talent. I'd drop gag order for it but with your focus on 5 mans you can get away with 2/3 Incite as well.
Glyphs: Cleave glyph is important for your aoe aggro, longer charge range has almost no benefits on PvE.
Regarding ZA trashpacks, they are awful designed for both rage based classes..
Bear: You can't attack the first one at the stairs until they've arrived at the bottom. For the last trashpack before the boss i'd highly recommend CC at least one of them, neither heroic leap nor 12y thunderclap cover enough space to get them all.
Lynx: It's even worse, without a point blank aoe (consecration/dnd) you'll have to work very hard on getting the initial aggro. Watch out for your healers positioning, one finger next to the intervene hotkey.