Spinoff/Mobile Battle Advice?

So I've finally hit a real roadblock at Chapter 17, and I was wondering if anyone had any advice for the battle. I'm using Nanu, Blue, and Pryce right now, at levels 62, 70, and 60, respectively. As far as type advantages go, I've only got Brycen left, but he's underlevelled. What sync pairs did you use?

I went with Kahili, Hau, and Rosa, but yeah, the fight was a bit tough. Pretty sure my team was at least in their low to mid 70s before I had another go at the battle. Hau's very destructive with Discharge, and he worked very well with Rosa's move gauge refill + Sp. Attack buff, as well as Hau's own.

I barely made it through after bringing Nanu and Pryce up to levels 80 and 75, but it was really close. For the next chapter, it's looking like I'll need to raise Barry, Korrina, and Hau up to the next level cap as well