Well, I have not used them with milk, and yet not open Vetiver, kind of saving it for spring. But orange blossom is a dream to work with: no discoloration, no acceleration, no ricing. I don't see why it would not behave with the mild.
None of the CS Fos I have used have presented any problems so far, but I do read reviews, and a couple of floral people said accelerated I avoided. Al the ones I have used have behaved well.