With Dwilight's size and distance of rogue travel, it may be that rogues striking are hitting not due to current density but due to density from a week or two ago. A target is chosen and then monsters have to traverse rogues, seas, and then more regions to reach their destination, by which density has shifted. This is partly why the pressure is cyclical.
It takes both realm and continental density into account.
Realm density we can work with, continental density not so much
