I feel for ya, had the same problem when I was on a PVP server. Its just a joke really they see a multiboxer and go "lets gank him till he quits the dirty cheater"..... Can't see that changing any time soon.
Re-rolled on a PVE server and cruising along nicely.

An addon to try is nkMulti from curse.com its fantastic makes leader changes, following and all sorts of tricks possible.

My groupies
K/W tank
P/K heals
M/P dps x 4