Wow, MLB fluffy with a light roster like that and still not a light main? Your other elements must be bonkers good!
Anyway, 5 Hagith staffs is actually sub-optimal from both a support and dmg perspective. If you have 3 UE Axes, you should have at least 3 UE staffs, and 3 UE plus 2 Hagith staffs gives you more dmg AND more ascension (at the cost of defender) regardless of HP level. The problem with Hagith staff is that its ascension level is not that high due to lack of FLB and its lack of assault makes its vigor much less attractive.
For non-Andro builds, 3 UE plus Yule Goat plus Herc axe for axe grid actually deals more dmg (probably use Sphinx hammers and Pheonix bows for the remaining slots for defender, you can consider using one Hagith staff as well if you are fairly confident that you can maintain high HP for bursts, but I wouldn't use more than one.) There's also going to be an axe from light Labyrinth, but it's not FLB-able and doesn't have defender, so worse than Yule Goat but a passable filler for when you're not using Herc.
If you have at least 2 Sphinx and 1 Nandi hammers, you can also wait for Nandi reprint and go hammer grid - 2 Sphinx, 2 Nandis and 1 Heryshaf from upcoming advent (that one doesn't have FLB and so it's just filler, but better than SR hammer at least.) That's actually a pretty hard hitting grid.
For non-f2p, if you have dupe Tish lances or Vishnu wheels, you should consider bricking them.
EDIT: oh and for staff grid, remember Andro's soul weapon is also a staff, you only need a 5th staff if you're not using Andro (but then why staff grid?) or you really need the ascension (if you're going pure support or AAB-ing, you may want to consider using Hagith as main to scale up both ascension and defender.)