Hi Ted:
Fished there for years, and by far the best performer was an iridescent blue/chrome 4" plug fished on a downrigger without a flasher. White is also another decent plug colour for rainbows; pink for dollies. Have used white, green and purple haze hoochies behind a dodger on a downrigger as well. Downrigger depths anywhere from 45' - 110', depending on the time of year.
If you happen to be there when the lake is flipping, (temperature layer inversion that brings the fish up closer to surface), fish black/white, blue/silver, or green/dark green bucktails right on surface about 100' from the boat. Bucktails fished behind planer boards in a little bit of a chop can produce well also. Dollies will hit pink/white polar bears with pretty good regularity. Apex hockey sticks also work pretty well when the fish are near the surface...a split shot 4 - 5' up from the lure is enough to keep it just below surface. Again, blue, pink, and green are good colours for Apex. I always preferred the wider models as opposed to the longer, thinner kinds, as they seem to me to have better action.
I fished there for over 10 years, and I always heard of guys using different spoons, so I tried them, but I never had much success with them...maybe it was just me!!
Tight lines and good luck!!