Shai
This has been posted on April so I'm not sure if you're still interested on the answer. But oh well for what it's worth, I would go for Donate Fashion. I believe if you use Sunday Dress + Legendary Hair, you'll miss out 50%(?) MP more or less. Because I don't think a Legendary Hair has MP% stat on it. If I remembered correctly, it's just %ATK and %HP. I had a hybrid FM before and I think I had 710m+ Asal with at least 400m HP and that is w/o Seraph Buffs. I'll try to do it again with my FM just to be sure. I can share you the build if you are interested.