Healer etiquette 8 man parties

Easy..we roshambo for who we want to heal.

Pretty hard with 2 whm, im most of the time sch and the whm always says who i want to heal and i say, both, u focus whoever u want, on coil i always focus on mt, but for 2 whm u must always (if u dont have voice communication) say that u will use benediction first and a macro always helps, is terrible when both whm use benediction on the same target at the same time