I'm positive about this recipe that contain 1 plasma fruit that thirst was on same level. And this vampire never got sick from other fruits, only he didn't get cosy fire moodlet from flame fruit.
Maybe there is a recipe that contain more plasma fruit and vampire consider best nectar. I tested only 2 recipes so far. I was surprised to see that first plasma fruit recipe I tried is amazing:)
On mixology tread I wrote about more research regarding usage of plasma fruit in drinks, and I still don't know why I can't use it even if I can stock it in bar. Also, vampire keep ignoring ANY harvestable stocked in bar. Beside plasma fruit, Sims avoid using only garlic in drinks. Even potato works just fine.