Some hot takes for everyone:

Addersgall should be tied to dot procs the way brd used to work. It should be a large enough chance to get requisite use of those heals, but small enough to where you're not constantly overcapping. That's an easy way to tie heals to dps, even if it's passive.

Addersting should be built through a gauge similar to esprit. You fill the gauge through the gcds of yourself and your kardia partner. Make the potency the same as dosis so it's fully neutral, and a resource you can stockpile up to 3 of for uses such as; heavy healing segments that you would want to have double weave slots for; heavy movement sections that you want a few gcds' worth of instant casts for; upcoming aoe sections that you want to nuke down quickly (similar to stockpiling lilies in dungeons on whm); and other such cases. This would be a more direct form of tying heals to dps, since toxikon also heals.

Idk, I'm no job designer. And I should already know by now that healers are big dummy dumbheads who don't know how to optimize and would shrivel up and cry at being given options to do so.