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I have seen perch caught in 70' of water during mid winter. I couldn't believe it but I saw it with my own eyes.
keep in mind that perch and walleye reverse rolls on most lakes that have them in there.
All you boys are talking about are how to catch perch on big lakes, WHAT ABAOUT THE INLAND LAKES that arnt so dang big, from my point of view inland lakes are the hardest lakes to catch nice perch out of.
That is because alot of (not all) smaller shallower lakes don't support a good fishery of large perch. Lots of little ones, few jumbos. Sometimes you can get into some big ones, but like you said, it is tough. Large, deep lakes are more common to support a population of big perch, but not always.