I dont target 'em but I've caught quite a few at 11-mile.They like kasty's in silver/orange or prism pink(my own creation) or lazer jigs in chartreuse and pink.I always tip with mealie or tiny piece of worm.They usually hang like 5-20 ft under the ice over 30-50 ft.Lots of people fish over deeperwater.(80-100ft).I rarely fish over water deeper than 25 ft.Ive caught most of my kokes in 15 ft or less. It seems to me they like to hang in open areas.Thats all I know..
I've picked up quite a few kokes at 11 Mile just drilling holes when things slow, dropping the vex, then dropping my standard trout jig down on top of them. If the fish seen by the vex are kokes they often hit the jig on the way down. They seem to like flashy jigs (kastmasters) or tubes (chartreuse or pink) but definitely won't hit a dead stick.
I have had great luck for little Kokes at the snake river inlet of dillion. I t is shallow water only about 15 ft max but usually catch quite a few on little orange jigs tiped with any wax worms or corn.