Most, if not all of the damage in these heroics is avoidable. So if you're having trouble keeping up, you might have to fight that undesireable/uphill battle of asking the dps to please not be dumb. They will tell you to !@#$ and heal more and you'll then head to a different thread in the forum to commiserate with other healers.
As far as tips go: I would stack spirit as much as possible until you get your casting dialed in.
Also, I've found that Capacitor Totem is really pretty useful. Drop it right on top of the big group your super macho tank just pulled and get 5 seconds of zero incoming damage while the dps continue paying no attention and pew pewing. No one will ever notice you doing this, nor will they care, but it actually helps a ton imo.
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