Bait is always good. On last couple of trips, 40 to 50' is where we have been having the most luck. Spoons & minnows at the bottom is where the perch have been. They are not showing up in the water column. We have been getting a lot of bites where nothing would show up the graph.
The lower end of the lake is where we have been catching perch.
Also, beat the boat floor with a stick. This seems to stir them up.
Good luck