While playing rounds with different mutators, I felt that a few changes could make the one or another more enjoyable. Just wanna put my ideas here for discussion/completion.
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Vampire
No auto-regeneration for vampires, imo. Differs the gameplay a bit more from vanilla gameplay, as there is no more hide-and-recover possible.
(Weird idea: let a vampire suffer from damage after x seconds of dealing no damage. Limit the max health to 100 as well. ==> Could this get so balanced that it is possible to have vampires and humans playing mixed in same match?)
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Resize
It is a bit anti-intuitive, that a wounded player is slower than a fresh one. Usually you wanna escape and urgently need speed when you are wounded. Getting slower is kind of a double-punishment.
So, my alternative idea: Make players faster with lower health, but scale down the damage they deal.
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Expert
Kick damage and grenade damage should be off here, I think. It has nothing to do with aiming at the head, and this is what the gamemode is about (at least how I understand it).