I have an honest gameplay question.

Can I do Insane with this team?
All the girls have similar level of investment
>lvl 80
>40/40/40 gear
>Ex at 4
>skills at 7/7/7
Shiroko is 90 with tier 7 gear though
I did Extreme and is too easy
But I tried insane and everyone dies super fast even after I move them with Mine