i don't know why i didn't come up with this in the first place, but it needs really only one prompt for good or perfect hands.
deformed-joints:2
put it in negative like always.
EDIT: if you have really trouble with hands like with this lora Masamune-kun no Revenge - Kinue Hayase - v1.0 | Stable Diffusion LoRA | Civitai
i have tried to improve this prompt to "force" very good hands.
unhealthy-deformed-joints:2, unhealthy-hands:2
works insanely well. please test it and tell me your experience with it.
EDIT2: and here a third one that i had to test with "lively overexcited having fun" that normally generates only horror but not with these prompts:
physical-defects:2, unhealthy-deformed-joints:2, unhealthy-hands:2
results here: Something - v2.2 | Stable Diffusion Checkpoint | Civitai