for mission 1, demon dodge is a must..start the fight with that and you'll be S or SS already before Kat tells you to follow her.
This. Just do your best at avoiding getting hit so the counter won't reset. Take full advantage of the aquila when times don't call for the osiris. T, T, pause T (hold)T aquila, two hits with delay with rebellion, third hit switch to arbiter for that quick heavy TT(hold)T is an easy and quick go-to if you're sticking to the ground and want to deal heavy amounts to large crowds at once. Aquila's ground circle the jesus out of every witch you come by so they don't interrupt your steez.