recount tracks absorbs correctly, and absorbs are shown correctly on world of logs, no need for skada.
this fight isnt healing intensive, there are moments when you dont have to heal at all, so your overall hps drops a bit lower.
on the meteor phase mind that only people who might need healing are tanks. assuming other players are able to avoid waves/flames, noone else should be taking damage.
have tanks standing on one side (say right) ranged kiting meteors to other side, 2 healers can kite as well, just a matter of getting used to kiting.
as for your healing, while low hps means nothing on this fight, you seem to be putting quite low amount of healing compared to other healers.
you have around 40% (almost 50% on longest attempt) overhealing from poh. if its to stack da, then its perfectly fine, but i doubt it was the point, since then you have round 36% (44%) overhealing from da (=you didnt restack it for next trap/seeds).
atonement, while archangel can be fun, yeah, you dont need archangel boost on this fight with 3 healers, would do better stacking da on raid than stacking evangelism stacks, to overheal with poh after trap/seeds.
but again, this is my very personal attitude against atonement on this fight