Issue with mob targetting/healing

[hastur]

My tank is a paladin, if the cast stack triggers his lay on hands, or tells him to heal someone, he won't bounce his target back to the mob unless I do it manually. Anyone have any ideas on how I can get around it?

It works if I run an autotarget script with that toon, but that comes with its own problems because I don't really know how to do anything except have the script target the nearest mob ALL the time, no matter how far away the mob is.