Unholy Desire Mix - Sinister Aesthetic (Illustrious) Reviews

When I enter "sagging breasts", a broken image like a flesh cushion is output about once every 30 times. I can't fix this with negative prompts, so I'd like some help. When I enter "unholy aesthetic", a solid black image is displayed about once every 100 images, but with "unholy aesthetic", a better image is output. It's just black, so it's not grotesque, so I can bear it. Everything else is incredibly good.