Trolling for perch has anyone tried this?  what type of setup? how do you pattern the perch through out the year? (Great lakes)

Nobody trolls for perch that I know about. Perch are usually schooled up on or near bottom from 30-65 fow. People look for the massive schools then set up over them fishing vertically with live bait or small jigs or spoons. 

When perch are scattered from recent storms or post spawn I sometimes catch them on jerkbaits while drifting.