As mentioned elsewhere, the DPS requirement from healers (and tanks) will vary depending on your own DPS, but I would typically be pushing 500-600ish DPS + 1500ish HPs up until the split, after that my DPS get's much more opportunistic with a couple of notable opportunities to get dots up whilst the whm and fairy cover. I ended the encounter at 330/2200
In regards to the bickering on this thread, I really don't understand why people feel so strongly about this 'argument' and insist on trying their utmost to discredit anyone else's view. I'm about as much of a career healer/support player as it's possible to be with a track record dating back 16 years to Everquest at launch (More if you count anatomy in UO!). If I had the choice I'd be playing the full heal/no dps role everytime but alas I'm progression and thus need to DPS to help the group beat the checks early. For those that are anti DPS, that's fine and entirely valid, just please respect those that are willing to DPS and stop derailing every last topic on the matter with your pseudo book thumping. It really is quite boring at times =(