Do you have by any chance Light Gabriel?

I decided for now to stick with Shingen on my Light team which is nearly the same as yours with the exception of Gabriel instead of Sol (Sub excluded now, I have Anteros and Djehuti there).

Kamihime General Discussion + Q&A-screenshot_8.png

So far I have pretty good results in regards to Burst (Gabriel Atk Buff + Diana Atk Buff + Michael Buffs + God Kaiser buffs) aswell as Burst building thanks to Gabriel and Michael. Herc is always an option, that's for sure when you have some extra buffs.

Nontheless, even without Gabriel you should be safe and fast enough in BG gaining with what you have, so Shingen is still solid thanks to Michael.