Your video is pretty much identical to how I've always done him, but I'm just too lazy to ever fraps my runs (read: too lazy to go download that software). Initially I pulled him further down the stairs to the prior room where there is a lot more open area to spread out (increasing the distance between toons), but for the last few months I've just been doing him in the same spot you are. I was always concerned of LoS issues with doing him up there, but has never been an issue for me ever since trying it. Assuming you have the nature resist and ability to get heals off fast or have a good group heal, then he's actually a fairly simple fight. My brother remarked what a joke it had become once he came along on one of my runs (well, more than once since it took about 2 weeks of daily runs for Loken to finally drop his axe for his DK).

But I'm curious, what is the knockback you are referring to? In all my time going there, I don't think I ever recall having to deal with a knockback. None of his abilities mentioned on wowwiki suggest he has that ability. Maybe you have that confused with another boss.