I typically set the priority like this
@mouseover
@focus
@target
@player
I then set my tank assignment to focus. The benefit of this is that hitting a keybind for a heal always goes to the tank when you aren't mouseovering a unit. Kind of a failsafe for me, if I'm raid healing i just need to edge the mouse off the raid frames to dump some quick tank heals. Plus by using specific focus buff bars it makes it easier to keep a close eye on weakened soul and the like.
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