Suggestion:
We know that Vampires and Werewolves have a special night when they are more powerful, when they come out and prey on victims, transmit diseases based on the moon cycle in Tamriel.
For 1 special night, During the full moon for werewolves and the New Moon for Vampires, the penalties do not exist, werewolves and vampires are strong and dangerous during that one special night of the month.
Just a thought. I think it would make playing them fun again.