Putting too much acc on a relic should be avoided if you play any of the other healers, because you will have a huge discrepancy when you play the other classes. If you have some on the relic it should only be enough so you can still hit 592 on the other classes with accuracy food. That means melding the majority of it on your gear, if you have to make changes to the relic you can with crystal sands. Ultimately you should be planning your acc around the bis 275 weapon if you raid, and that's just two heavens' eye V.