https://i.gyazo.com/deb755669da1eec5...4a24c49564.png
https://i.gyazo.com/ede329c5b4590ef8...14ad89acef.png
Hmm those overheal numbers look pretty comparable, despite the extra damage and more healing required on average, I'd say. I just happened to press the GCD barrier more times, but still had less overheal with it. I imagine the 'overwritten' ones come from places like the Tracking Tremors (applying a new one before the stack mark takes the old one off) or the mit check right after the adds. Also:
https://i.gyazo.com/4386fab66d90b48f...7cb7099cff.png
Again, didn't use all of my everything, else my overheal would be even higher again.
Lastly, both me and my coheal in this run got purples on damage (me 81/them 94) and grey/green on healing (me 21/them 27). Could coordination/'synergy' be higher? Sure. But it was again a PF, and everyone just wants to get their reclears done and move on. Even so, I'd say that us both having sub-30 Healing parses means that we pretty effectively divided the healing requirements between us, but still, I had more in the tank that I could have used (which would have also ended up as overheal).