Exactly how i felt when my group started T11.
Try to keep up Regen on both Tanks all the time. It really helps alot.
Usually, Regen on Offtank + fairy heals + maybe some small cures are enough. For MT: Regen again + feel free to use ALOT cure1, dont wait for the tank to take damage.
Use your Cure 2 procs, depending on how low the tanks are, you might also need Cure 2 without procs (spam it if you must, to keep them alive). Of course, tanks should pop cooldowns for resonance.
During Nerve Gas, Regen should be enough to top them off, while you might stoneskin them.
Sometime at 75-83%, you might wanna shroud, so its up again during add phase.

Our bard does TP song, followed by MP song shortly before adds, so Monk gets TP, and summoner + healers get pretty much full MP when entering Add phase - i strongly recommend that. Untill you are familiar with add phase, a WHM can burn easy through 4k MP during that phase. Thats what i did, and i had around 5450 MP during that time (now slightly less, because Yagrush --> T9 weapon.).

I promise, you will get used to the fight, and having MUCH MUCH less MP problems. Now, untill adds, i mostly never run below 4k~ MP, and at the end of add phase, i have like 2500-3500 left. Enough to presence of mind + Stoneskin everyone (except tanks, them only in the end if its still time), get ready for a divine seal + Cure3 (or medica 2... both works fine) for nerve cloud + a divine seal buffed regen on both tanks.

During add phase, 1 Medica 2 every other AOE is fine. The rest gets topped off from fairy heals + medica 2 HoT. you are busy enough curespamming both tanks, + again, keeping regen up on both.