That's going to be a badass team you'll have eventually. You've kind of got the same issue as me, and that's having Kuda and Kuhla. Kuhla is kind of worthless with Kuda. I value that extra 10% crit (40% over Maxwell's 30%) more than 15% attack (100% to Kuhla's 115%). I'll almost always take Maxwell though. But yeah, Maxwell, Zelnite, and Kuda I feel like are now staples of my team (and Elza too, but you didn't list her).
But otherwise, Ulkina is a badass, Rowgen is fucking crazy STBB (wish I had gotten one to replace Lilith), and you've got Narza covered too.
I burned up all my off color crystals and gods on good units. Like, Kuda would be sitting at around lvl 50 right now but I used a bunch of light and earth crap.
Ishad, it's too late. I went and 0 gemmed trial 4. Zelnite (lead), Dilma, Lilith, Elza, Exvehl, and Darvanshel (friend). It was cake, just needed to know not to blow May up without getting the buff to mitigate Emilia's SBB.
Now to figure out a team for trial 5.
Edit: Just ran into a team with a bunch of the defensive items on (Aegis Cloak?) in Arena. Still fucking crushed them. This arena team is so awesome.
I'm not doing anymore summoning for a while. My team is basically about as good as it gets. Like I said, I have Oulu. If I can't manage a Darvanshel friend, Oulu should be sufficient. Maybe when Cardes comes out I'll worry about it.