1. It is good practice to get a feel of each boss's attack speed so you can gauge when the next hit is coming. Unless experiencing serious MP issues, you can chain Physick if you don't trust your fellow healer. If you do, observe if s/he is inducting. Remember that in Coil, 1 Physick/Cure is about 1k heal. So if the tank is 5k out of 6k max hp and the other healer is inducting Cure, you may wait till the next hit. Remember the fairy will not top people up (from 80% to full) unless manually commanded to do so, and there's a cost to it (causing Eos to blow all her cds, for example) as mentioned in the guide.