Tanks often are a bit headless.... they do big pulls in a 2 monk party and newbie healer then even loose hate on half of the mobs and blame the healer. A FC member just had the issue that the tank pulled a boss without him being there (firsttime run for him and he was the healer)....
Im personally a horrible whm but c2 spam, regen, stoneskins presence of mind and ds as needed and a m2 (when you sure tank has all aggro only!) to prevent other party members from being killed by smaller aoes or random aggro attacks like in bray hm. Put benediction on a trigger button so you can use it if needed. I also recommend the swift + stoneskin method but theres also swift + holy pretty common then top party up and keep mobs on stun with like 3 more holy....
But in the end all up to you as everyone has his own healstyle...