I ran WP for the first two times this morning as a war with Ilvl 55 against quite a few geared people(80+). If the dps don't throttle down a bit they can make it messy but, the healers didn't have this issue. I made a few large pulls to find out what I could handle and it stayed pretty much the same.

We never wiped, though I've found Blms have no idea how to move away from a giant angry flan. I was taking a really good beating trying to chain pull at their speed.

If the issue was on your end possibilities are already addressed. If it was on his end, I had to spam the crap out of overpower and flash to keep threat. Once I started doing that I never lost threat again. Opening with Infuriate > Unchained > Tomahawk > Overpower spam with a few Flashes mixed in should keep him way above everyone else. Berserk and Internal Release can be mixed in as well or saved for the next pack depending on how fast you are moving.