I would suggest fighting near your shamans on the first boss, that way your AEs take out the tombs (and their chainlightning). Alternately I just drop my magma totems to kill it. This seems to save me from EVER having to heal my team on heroic mode. If you just left the tombs alone you will definitely have to heal him, not to mention it's one dps that isnt dpsing and this is a bit harder on heroic so every bit counts.