Your third point is relative to strategy being used when placing golems. Can't really comment on that since my group does not do it that way. It sounds like you are already doing your best to maximize damage with timed shadow flares and utilization of contagion and bane in the proper manner. If you're already taking golems down comfortably, you might consider saving raging strikes (from your description it sounds like you're using them on 2nd golems?) for the heavensfall phase to bane onto the ghost prior to LB3.