Are you straight IWT? I dont think that is entirely viable after leveling, you still need to tweak positions. I find the follow -> twitch separate and move the boss with the mob with the tank rather than the melee respond a bit easier.

Some keys, like "move other window (melee|slaves) (forward|back|right|left) on down event' is vital ... and a lot of people dont.

I would suggest a follow focus, follow tank, follow healer setup so you can easily control a melee character and have everyone non tank rally to him. I almost always have this a warlock that teleports away and the melee will roll towards her for a bit.

There is a a lot of damage without going all melee as well.