My son drew antler less in Umtanum.  We hunt the Manastash/Umtanum area.  I'm more familiar, like you, with Manastash.  We are going to spend a lot more time in there this year as he also got the multi-season tag.  I do wish that I knew more of the West/South side of that unit.  I do have some good topo maps and the GMU map too.  Not sure I'm much help, is what I'm saying, but I'll help if I can.  I do look to colleagues for guidance when I'm in need, but I hate to ask too.