Thanks for the pointers. I do have summons (pets actually, wolves, one for each character) and use them to block the knights, but even though they have some 1400 HPs they are almost killed with the amount of damage and attacks the DKs have each turn.
Madora does not have flurry, I donエt remember seeing that skill book in any of the vendors (damn random loot system) and I certainly never found it either or I would have kept it; I never took glass cannon, but I do have bully. I try to haste her and give her oath of desecration whenever possible (all of my characters have the oath).
I will try lowering their resistances and using status attacks.