Those numbers look like the basic 2/1/1/1 heal team everyone uses but with druids and shamans dpsing half the fights. Are you really missing out not healing razorscale, kolgarn, and the other easy encounters? If druids and shamans weren’t adding anything then why do most guilds bring them for the difficult encounters? Because they do add value.
Buffing restro druid also does not change the dps between ret, ele, and moonkin. How much tinkering is supposed to happen here?
The upper quartile scores are very close except for disc priest which is going to get better as a raid becomes more routine because of how shields work. The more you run it, the easier it is put them out at the right times. I’d be willing to bet when progression happens again disc numbers will go back down. And there can only be one anyways. The other 4 are so close its more about cd’s and how each class heals vs the damage patterns. Again there’s a reason most guilds have 2/1/1/1.