Bart,
Alot of the forage fish that the larger walleyes are following in the summer months are palegic(sp)feeders. There is a huge amount of emerald shiners as well as ciscoes that have grown by that time to a perferred size. I fish LOW alot in july and august and have always caught big walleyes trolling crankbaits in open water.There are large fish around reefs but number wise a majority are suspended in the big traverse bay section. Find the bait fish find the walleyes. I look at it like this. If someone said we could eat 1 prime rib(shiners, ciscoes) or 10 party weiners(bugs etc.) what would we do ?? Best of luck.
cdemeyes