Whitefish are a bottom feeding fish - hence their downward facing mouths.
Try using a
Badd Boyz lure tipped with a plastic lure (like a squirming squirt). These lures imitate a small fish feeding on the bottom.
Lower the lure to the bottom and keep it just barelly touching the bottom.
Another lure that seems to work well is the Williams. Gently flapping it around on the bottom every 6 seconds and giving a stronger flap every 5-6 flaps.