If by "healer DPS" you mean DPS's not pulling their weight and the healers and tanks aren't outputting enough DPS to make up for the deficit thus causing enrage, then I could see that happening. If you are saying that healers doing DPS are causing wipes then I just have to say either the tanks aren't mitigating properly, people are screwing up mechanics and are creating more damage than the healers can handle, or just bad players in general and nothing to do with the play style of healers doing DPS when healing is not needed at the moment.
As for my personal progress, I cleared it on my first learning party and got my Susano's Greatsword after a couple more runs as a drop.
