Heads up zargoza, update your sig. It says feral. I'd also do armory links rather than plain text, so we can look you up and offer advice.
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First: when pre-hotting the tank before a pull, which part of my heals gains aggro on the mobs aggro-list? I was under the impression that any healing done after entering combat will create aggro, hence putting 3 lifeblooms and a rejuv on a full health tank is technically zero healing done until he gets hit, am I right? The reason I ask is quite often (on a trash pull) the non tanked mobs seem to run to the moment the tank has pulled. Should I wait with my hots until we have entered combat? I guess this is more of a game mechanic issue but it's still caused a few hairy moments on the occasional heroic.
Over-healing causes no threat, but even HoT's cast before the fight will cause threat if the tank either takes damage or had damage on him already. If the tank has built up say 37 threat from thorns on each of the adds (but not any from TC, etc) you only need to do 97 healing (factor in 50% threat on heals and 130% threat needed to pull off the tank when out of melee range) to pull. My untalented and ungeared rejuv/regrowth ticks at 62 are over 200, so you're obviously going to pull if you're talented and geared for healing.
Waiting until the tank has built sufficient threat (which honestly shouldn't take too long) to start the healing process and having more crowd control are two simple ways to solve this problem.
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Secondly I seem to go oom disturbingly fast (this is especially relevant to 10 man raids). At the moment if I can I stay in tree form as long as possible, casting the usual insta-hots and regrowths but around 2/3 of the way through the fights, I am having to rely on my mana-potion cooldown to be down. And yes this is also after having used innervate. I basically avoid using Healing Touch at all costs bar emergencies - and even then it's nature's swiftness -> healing touch.
At the moment in heal gear (unbuffed) I'm looking at 1324+heal, 375int and 411spi which admittedly isn't fantastic.
There's a few things I must say about this:
1. You left out your MP/5. That really matters, especially when you talk about going OOM.
2. I dont know about everybody here, but I much prefer mana pool to +int. All int does is buff spell crit, mana pool, and maybe healing (if you're going deeper into the balance tree). Spirit is important though as it helps tree form.
I'm not too familiar with druid stats, but there could be a number of reasons you're going OOM (note that these are not mutually exclusive, more than one may be true):
1. If the fights go with less CC than you should (like I said would help in problem 1), you may need to be putting out more healing than is necessary. 2 mobs will do roughly 3 times the damage as 1 mob (since your tank is getting hit for double damage for the first mob, and then single damage for the second, adding up to 3 total), and that scales in a very nonlinear fashion. The more CC you have, the easier it is on your mana pool.
2. If any of the other healers are undergeared for the fight, you may be burning more mana to pick up their slack.
3. You are undergeared, and need better gear.
4. Your spell rotation is wrong (note the keeping regrowth out unless you need to). Using less mana efficient heals, or overhealing too much, wastes mana. Your goal is to get the most damage healed out of each mana point while still keeping everyone alive. Don't forget about swiftmend!
5. The DPS is slacking, or else not prepared for the encounter. Case in point, doing VC (I know it's low, but as most everyone's done it and I've run it hundreds of times, the examples I get from there are plentiful) I ended up with a group of 18 priest, 19 rogue (me), and 24 druid. Yes, 3 people. We did great, all of us knew how to play and what we were doing, but on the final fight we would die because the priest went OOM. When we'd cleared it out before in a 4-man group with no real tank. Why did the priest go OOM? The fight went on longer than her healing could keep up. Longer fight = more damage taken by the tank = more healing needed to be done = more mana spent.
If this were a paladin/priest/shaman forum, or a HT based heal spec, I'd suggest downranking as well, but I dont believe downranking helps HoTs a whole lot.
Hope I helped, and hope it's not a wall of text.