I am looking for suggestions to generate threat on a lot of different targets quickly, especially ranged targets. The paladin is not my main so the amount of time allowed to spend practicing tanking is minimal. I don't have trouble holding single targets, but I struggle with 4+ trash mobs.
My pally's armory: Keko
I was tanking a Heroic UP while my husband was on his freshly dinged 80 and green-geared warlock. There are four pack trash mobs on the way there. As my avenger's shield goes off, the warlock seed of corruption goes flying over head. Next I concecrate and then SoR all while more seeds go out. As the first one explodes, it triggers the rest of them and I start losing mobs. He dies.
Next is the gauntlet to get the boss after next down. This has harpoon throwers that get clipped by the seed of corruption but are out of range for the concecrate, or there are more than 3 targets. He died here too... twice (we had a druid).
I am looking to learn how to play my paladin tank better so that I can generate threat quickly and hold aggro against burst AoE damage. I don't want to tell the warlock to wait (the term is "payback's a bitch") since I did the same thing to his druid tank. I feel it's saying "don't do your job because I can't do mine".
I'm willing to change rotation, respec, or go farm any gear available from heroics, VoA, or 10 man Naxx (this is an alt and doesn't make it into any other raids). I just want to be better at my job and looking for any suggestions that are available.