There is a stretch of shoreline just outside my HQ, Greyling & Deer were spawning and my boar were dying. I blanketed that stretch of beach with workbench coverage. I am still always finding deer parts but two days ago I was feeding my boar and I saw a Greyling spawn. I ran over and killed it, then whipped out my hammer to see if I had missed that area with workbench coverage, I hadn't! Although the instance of Greydwarf spawn is a lot less than before, every once in a blue moon one will spawn despite workbench coverage it seems.