Devil Survivor: Help with Gin's path

So. I'm on Gin's path, shit's been going pretty fucking smoothly up 'till now.
I'm fighting Belza-motherfucking-boul and this battle is pissing me off, because the little bee things are faster than nearly all my characters/demons (except Lorelei but it's got mainly useless attacks).

Here are my teams:
Hero: st18 ma18, Hecate and Cerberus (shit I know, but I can't raise his level high enough to get decent demons since the free battle has been purposely set with low level enemies to prevent me from grinding)

Amane ma29, Astaroth and Aniel

Gin, st20 ma 14, Lorelei and Brigid

Yuzu, ma24, Peri and Laksmi

I also have Izuna, but the boss drains physical attacks.
Advice?

If you're having fly problems I feel bad for you son, I've got 99 problems but the bels ain't one.