My guild started heroic modes this week I found it almost impossible to keep up in mana on heroic feng. we had to get spriest mana cds just to last though the fight. The only real break we had in healing was Spirit of the Fist
that was because we either shielded the epicenters or stunned them the rest of the fight the raid dmg was fairly high.
i guess my question is how to deal with this i have taken to stacking spirit just so i can feel like i can last thoughout the fight i have been using spirit flask/food. i have logs of the kill and wanted to know if there are any thoughts on what to do here. or am i just miss using my mana.
World of Logs - Real Time Raid Analysis
Spirit flask/food in general is a really bad choice, during 6 out of 9 fights you didn't even get two extra rejuvention from them, in order to gain more from the flasks you should be using intellect flask/food. I don't know what the heroic situation looks live, I've personally only killed the two first bosses on normal, however I as a 10 man raider in ilvl 366 gear is pulling roughly 55k hps when I perform well, never drop below 50k unless the healing isn't nessecary. I also do those kinds of numbers while raid leading.
I'd say that the problem is that you have alot of overhealing from your hots, especially rejuvention which is at 44% overhealing, you also seem to drop lifebloom alot, you should really try to have it at 100% uptime at all times since it is _the_ best healing spell of druids when it comes to mana efficency (2k mana for 15 seconds of steady healing is unvaluable).
I'd say that you should work together with your other healers to make sure that your hots isn't wasted as much as they are currently, and then just practice _alot_ of resto druid healing. Put emphasis on doing 6-7 minute intervalls where you end at 10-15% mana, you don't want to run oom during these practices, because you'd have no mana for panic actions such as regrowths that isn't clearcasted and so on.
If I were you I'd go for pure int gems from the JC gems, the difference is only 160 in pure stats, and in general I tend to aim at 1 int = 2 spirit, anything less then that favours int. The haste cap is at 3043, so you currently have 61 haste wasted, it's not much but it can help to reforge this away to mastery.
I also noticed that you have only about 11% uptime on tree of life, the optimal (used on cooldown all the time) uptime is about 17%, and it's a really good mana saving talent so if possible try to use it as often as possible in order to save your, and the other healers, mana, it's especially effective in 25 mans since you can lifebloom even more people. If you need the burst healing that it provides then I'd suggest going SotF instead, it's really effective when combined with Wild Growth and it really helps mending what Druids lack the most, burst aoe healing. I've been tending to benefit alot more from SotF just because I don't need the mana saved from Tree of Life, and my raiding group (10 man) lacks good burst healing. SotF is also really good to use with lifebloom on periods where no one but the tanks take damage, for example during the phase changes on Feng the Accursed.
I generally also tend to favour Heart of the Wild as my level 90 talent because it provides a solid boost, and therefor helps me save mana in general compared to the burst healing of Nature's Vigil, which tends to put my overhealing over the roof compared to my 20% average currently. It might be worth thinking about if you don't need the burst once again.
My highest recommendation is to stop favouring spirit that much, in the resto thread Hamlet have done some math about spirit vs Intellect, and as you can see in those posts, Intellect tends to benefit mana regen alot more then people think. I'm currently sitting at 8000 spirit, with my both trinkets being regen trinkets my mana regen equalls to 9400 spirit, you're sitting at 9700 without any kind of spirit proccs or anything factored in, so if I were you I'd gear alot more for int then the spirit you're stacking right now. Aim for roughly 11k spirit, at max, with healing proccs included (average of the spirit ofc, the Darkmoon card should be about 700-1000 spirit in average.
Wow this was longer then I expected, if you have any questions I'm open in PM's, here's a link to my raids:World of Logs - Real Time Raid Analysis
It might help you plan your healing abit.
However I do go DPS on gara'jal because I'm the only healer who can pull close to decent DPS,