That monstrosity must have an R of well over 300.
Your proposal makes sense - except it still gives too much leeway to these pukes. They have proven, with this one district, that they are not to be trusted, and need to be SEVERELY restricted in what they can do.
Maybe give them a ratio of 16 - and let them sweat trying to make it work.
With your idea, there would have to be a coastline/natural boundary adjustment.