I am by no means as experienced as many regarding steelhead fishing on the MI tribs, but I have fished the Muskegon with, and learned from, the best of them (IMHO) and I am covinced that an intermediate sinking shooting belly -- like the now mostly unavailable Guideline DDC connect -- is the way to go. For my Winston BIIx 13-ft 8-wt, a 480 grain 21-foot DDC intermediate belly with 8-12 feet of T something (T-8, T-10, T-14), five feet of leader and you are good to go. I have also used an SA Skagit Extreme intermediate belly (which while called "skagit" pretty much imitates the DDC) and (thanks to the Red Shed) I will be trying out the Airflo Skagit Intermediate Compact. IMHO, these lines are designed for the Midwest steelhead rivers and, at theast the ones I have fished, work as advertised.
If you really have to dredge the bottom, and S-2/S-3 or S-3/S-4 Guideline PT sinking shooting head does the trick. Again, these are now in short supply in the US, but I am sure others line companies will be making or already have similar lines available.