I only run one panful of smoke over my fish also, before pressure canning. Not sure what that equates to in a Traeger.
If you use salt, use NON-iodized. Canning or pickling salt is good. (1/4 tsp). Two tablespoons of water or olive oil for extra moisture, if desired.
And you can always add some extra flavor enhancements, such as garlic cloves, hot peppers, etc.