I went to Devil's LAke about 10 years ago and fished with Ted Robinette. It was a great trip and I caught about 40 perch a day. No real monsters, the largest was maybe 112-13 inches. A couple small walleye were caught as bonus fish while perchin. Great learning experience for different presentations not normally seen around Ohio.
Send me a private message if you want more info.
I would love to go again, if my budget could handle it.