by xutherogue » Sun Sep 13, 2015 5:54 am
First, priests will do both raid healing and tank healing. They are top tier at both. What you actually do in a given fight depends on assignments, but assuming FFA healing, I typically do whatever seems needed most. You should know what is actually important in a given fight. Consider broodlord, for example -- you heal tanks. If a dps takes a blastwave, that's really unimportant. The dps can go bandage, or slowly get spot heals, or something. Sometimes there are assignments, e.g. on rag, you have to have assignments due to positioning. In 40 mans, without assignments, it's a magical thing that the healing averages out, so that the tanks don't die. You are part of that machine, as is everyone else. Watch the tanks, don't be afraid to flash if you get scared they might die. Also, yes, cancel casting is great. In fact, you can get addons that track bosses swing timers, and time you casts around that. The spell you use when tank healing depends on a lot of factors.
As far as spells go, flash / heal / gheal / renew are all useful. Low ranks of heal are very efficent as you've found, so that's the spell you use when you need to stretch your mana pool. That said, don't be afraid to flash if you can afford it. As your guilds dps gets geared, you'll notice you have a lot of extra mana. At that point, flash healing makes your healing more robust, imo. There is a big opportunity cost in going for a 2.5 second and then having someone snipe it. That said, your gear isn't amazing, so that's probably not a viable option atm. But if you are using a lot of consumables (flask, sages, major manas, dark runes), you can spam flash heal at any gear level, so it depends on that too. All of this depends on the content, e.g. in naxx I think you use gheal a lot more (I've not healed vanilla naxx, tbh, but that's my impression)