Ed,
There are two people to speak to about this area. One of them would be "Fishing Couple" (Gary). He worked in the area for several years and might be able to provide some insight.
The second person to talk to would be Skillet007 (Kevin). He has family in the Baldwin/Idlewild area and has done a ton of fishing and hunting in that area over the years. He has an uncle (Jesse) that lives in the area and does a lot of fishing. Kevin should be able to help you out whenever he gets online.
I have a lot of experience in the Custer/Scottville/Ludington area. I also have a buddy that is from the Walkerville/Bitely area and I could pick his brains a little bit.
Welcome to the site by the way!
I have OCD "Obsessive Crappie Disorder"