I have both SCH and BLU at 75, and I find myself using them both for a variety of events.
I don't do any HNM stuff really, mostly Limbus, Nyzul/Assault, exp parties, missions/quests/ZNMs in lowman situations.
I'd like to save 5 magic merits for Blue Magic if possible, leaving me with 11 merits to divide on enfeebling/elemental.
For now I'm at 7 enfeebling, 3 elemental, 0 blue magic. Should I spend my merits on 5 blue magic 1 more enfeebling, 5 blue magic 1 more elemental, or do I need full elemental/enfeebling so much that I should completely scrap blue magic until SE ups the maximum allowed for this merit category ?