What would you like to have changed or added to Vampirism

https://www.curseforge.com/minecraft/mc-mods/lightweight-blood-mechanics
Cross-compat with this mod, e.g vampires will not bleed, and the blood meter will also sync between the two? Probably would require cooperation with the mod author.

Does this make the mod experience more balanced?

Yes.

Lightweight Blood Mechanics is still only available for Minecraft 1.12

This issue can be reopened when the mod updates

Only available for 1.12 atm, so we will have to wait until it is updated to latest MC version