From ice-out till early June, you will not need your riggers. The active fish will be up high in the water column and can be caught long lining minnowbaits, spoons, spinners, etc. We catch them in less than 40' of water, sometimes less than 20. Planer boards can be a useful tool speading your baits out. Speeds are kept slow.. 1.5mph-2.5mph
That's not to say you wont catch any deep.
Once water temps get above 60, someone else can give you downrigging tips.