DRK self sustain

Hi square, Im loving dawntrails game content so far, DRK has been my fav tank since shadowbringers, but in endwalker and especially now in dawntrail, they feel bad to tank dungeons.
Is it possible we can tie a heal potency per target hit by the flood or edge of shadow we get from the dark arts proc recieved from the blackest night breaking?
This is the only real quick fix I can thing of without changing too much stuff around, please and thank you!
DRK is my favorite tank, but I just dont want to grief my party, especially my healers in dungeons.
I am loving the way dawntrail is heading, please keep up the good work square!