Some general thoughts on the ideas:

Dissipation
- Dissipation has been and always will be a terrible concept. It makes no sense gimping your own sustained healing and cutting off access to several actions to increase your healing output through other methods. It's like buying a $10 bill for $15. I see no reason to try and salvage it when it should just be pruned. Making its healing impact more significant makes it slightly better, but it's a tumor that's better off excised than sterilized.

Energy Drain
- It's a simple suggestion that's been brought up before and would be totally fine. One issue not being resolved though is the constant environment where the current ED feels unhealthy to continue existing, but losing it makes Aetherflow management feel sloppy when you waste unused stacks on Lustrate or overcap on unused Aetherflow. Making ED the new Aetherflow like with SMN does actually exacerbate this issue because you're now more heavily pressured to use ED on cooldown as it's a part of your DPS rotation, essentially. A small suggestion:

New action: Energy Shock or some similar name.
- This is a GCD DPS spell that deals Broil potency damage to your target and 50% less damage to all enemies nearby the target.
- Consumes all remaining Aetherflow. For each stack of Aetherflow consumed, provides some type of stacking buff. A few ideas for this stacking buff:
1. Increases the value of your next Galvanize by 3%/6%/9% depending on Aetherflow consumed.
2. Decreases the cooldown of your next Recitation by 5/10/15 seconds upon use of Recitation.
3. Restores 4%/8%/12% of your maximum MP.
Or something along those lines.

This new action would give a way to burn Aetherflow that doesn't create an awkward priority system. The reward for using it needs to ultimately be worse than using Aetherflow on Aetherflow actions, but pushes the value forward into one future use of something so you get something out of unused stacks.

Fey Union
- I disagree here. Firstly, this creates the same issue that you're trying to resolve with removing ED as an Aetherflow spender, because now your Fey Union healing is competing with DPS. I feel the Fey Gauge should either be removed completely, or it should be reworked into SCH's healing resource gauge while Aetherflow shifts to an offensive resource gauge. I see what you're trying to do by making the Fey Gauge something worth remembering that it exists, but this isn't the right solution.

Gap Closer
- I agree with Osmond, a gap closer doesn't really need to be on SCH. SGE has it because of Phlegma, and it feels aesthetically fitting on SGE, but I don't really see a valid reason to put it on SCH, especially when SCH largely outperforms SGE as it is.

Recitation
- It's fine.

Selene
- Always in favor of giving Selene a different set of tools, and I do respect that this does not include any offensive buffs that would make Eos feel invalidated, though I think there's more room to consolidate here. I'd have Fey Illumination and Whispering Dawn merged, but remove the magic damage reduction aspect, and have Eos' two unique actions be that and Fey Blessing. For Selene, I don't necessarily think the barrier angle really fits with Selene. In most casts, the difference in whether you're applying a regen or a barrier with your faerie are two shades of the same flavor, and so it ends up feeling superfluous, generally. Instead, I'd suggest making Eos offer more healing and Selene offering more utility. Merge the removed magic damage reduction from the combined WD/Illumination over to Selene's debuff and have her inflict a debuff along with a magic damage dealt down effect so it has universal applications and isn't exclusively just a trash mob button (also I personally like the idea of having SCH inflict Toad instead of Paralyze since it's not going to work on any enemies that matter anyway). Then instead of a barrier, I'd honestly move Expedient over to Selene. I know most people would probably disagree, but I think it makes the choice between Eos and Selene far more meaningful when you're deciding between more OGCD healing or additional utility, especially considering Expedient is always a luxury, but never a requirement. Perhaps just make it the sprint and move the mitigation elsewhere to something SCH always has ready.

Exploitation Tactics
- I'm not sure if having damage based on damage taken is a good thing because it creates a lot of very cheesy situations. It should probably just be flat potency striking enemies that hit your target. That said, it's an interesting way to create incentives on barrier application, especially since it can potentially make Adloquium a DPS gain, though that also can create a weird and potentially dangerous incentive, not to mention how much damage it could deal when applied with Succor since it would supposedly affect the entire party. You'd be getting large DPS gains every 90 seconds and barriers when SCH is already a much stronger barrier applicator with its GCDs than SGE. Charges could help, but you'd probably also want it for burst windows. Honestly, I worry this might cause more harm than good even though it's an interesting idea. That's kinda the unfortunate aspect to healer DPS meta, it's very difficult to combine DPS and healing as the healing ends up being wasteful in pursuit of more DPS.

Overall
- There are a few good ideas here that could smooth out some of the clunk that SCH faces, but not all of it, and in some cases may cause different, new clunk in place of the old clunk. It also isn't going to address SCH's non-existent gameplay loop which is what all the healers really need to focus on with reworks, but I do admire some of the creativity here.