Frankly, I'm seriously considering eliminating donut regions entirely. They were an interesting experiment, but unfortunately I believe they have failed.
However, I won't be making any map changes in the short term.
I believe I can make sufficient changes to monster behaviour tomorrow to make a real difference, and I'd like to see how they play out, at least for a week or so, before making any other large changes.
I will, however, make one further note: There's a metric crapton of gold ready for the looting in the rurals north and west of the mountains, if the changes can buy you enough breathing room to send an expedition out there.
