Location. Some areas in a river just have a ton more whitefish in them. For instance on the bow river within the city there's a ton of whitefish. As you go further south they become less common.
Current speed. The water you are fishing could be on the fast side which caters more for whitefish. Find water that is a tad slower along seams.
Depth. Trout seem to "look up" more than whitefish and are more likely to take flies higher in the water column. I find i catch more white fish when my flies are dredging the bottom. Try fishing your nymphs about 6" off the bottom.
I'm no export but those are my observations. Hope this helps you.
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