**Second Hand Knowledge Alert**
I've heard that the Ireblind Imp doesn't have a large aggro range and that he doesn't assist other mobs, so as long as you head sort of northwest instead of due west when you zone in, you should be able to avoid him. You'll pick up more trash mobs that way, but it beats fighting Mr. Ireblind. This is, of course, assuming your standard West Wall break in technique.
Also, and take this with a grain of salt, I've heard that so long as you DoT yourself* (to break his mez) prior to the fight, he's not much of a battle. His biggest asset is catching people unaware and picking them off as mez breaks here and there, and forewarned is forearmed.
*Invest in Crimson Potions Edited, Fri Mar 12 10:38:21 2004 by Jophiel