Lot of different convos going on so I'll try and cover everything:
1. Better Lifebloom uptime:
If anyone else taking dmg or there is dmg about to go out, it's better to refresh with a LB and move on. Nourish does such little healing it's only worth casting if you literally have nothing to do, and yes, this will happen some phases.
If you do have time for nourish, you have a few other things to consider. Letting LB bloom probably isn't efficient. Even if it does more than the nourish, nourish procs harmony and takes less time than 3 GCDs. Are you having mana problems? Nourish at this point can honestly be taken over by RG or HT. Nourish is almost just a waste of time to cast now. Before, filler was good. Now, we have enough mana for other spells to be filler and not a problem.
So basically, if you have the time to nourish, cast HT or RG based on what is more efficient. If anyone else can be healed or you can pre-hot upcoming dmg, just refresh with LB.
Well I got into the habit of using Nourish to refresh LB + Harmony at the same time, not for the healing it did. Although, I did a run today and it was easy enough to break this and simply refresh with LB. I have no mana problems now but this is all practice for MoP. I expect things to go back to the way it was at the beginning of Cata with Nourish coming back into play again.
2. Tree of Life usage:
The people saying don't use RJ in tree are incorrect. Also, them saying don't use WG is wrong too. You don't want to ignore the basic +healing tree brings. It's fine you use RJ in tree OP. Sometimes Rj is going to be better than LB. CC procs aren't as important anymore, because even in HMs we shouldn't be having much trouble with mana. So, you are doing fine when it comes to tree.
You don't want to over complicate your spell choices to the point where you can possibly hurt effective healing. Just consider the amount and kind of dmg going out, consider what your other healers are doing. Can you easily time blooms to proc and will lead to more healing than RJs? Will RJs just go to overheal? Are you on a mana intensive fight where those CC procs are really important. ToL is a spell that can be used 100 different ways based on 100 different things. Trust your instinct, you know what you're doing. =]
I agree but again, I have time now to experiment with new rotations and spell choices. I was mainly wondering whether I should invest some time into getting that LB bloom timing trick I mentioned. It sounds like it could be very effective (burst healing for relatively low cost) but of course, the window would be very tight and even one second early could result in only a lot of overhealing. I wanted to know if other druids were doing this and whether they were seeing good results. If things get too complicated, I could always just stop doing it and roll back to my safe and effective healing method
One fight where I think this could be useful is Blackhorn heroic when the entire raid has to soak an onslaught. Paying attention to the timers and throwing out LBs on fragile classes seems like it could work well, especially since those nasty rushes go out soon after and people are in the risk of dying. That's probably the only fight in all of Cataclysm where I found myself wishing for more bursty heals than RJ + WG. The 4pc t12 helped a lot here but I still felt "weak".
3. Nat Grace:
It's going to do more harm than good trying to time procing NG with a high healing phase. Just use an addon like poweraura so you know when it's up so you can use it as well as possible. Don't not direct heal trying to not waste it though. You will just lose more healing than add.
Should I be doing anything differently when it's up? At the moment, I just consider NG procs a simple boost to my overall healing. I use a lot of regrowth so it procs as much as it can.