I looked up the directions for a Cabela's bologna kit . Says to soak the casing in a salt water solution for 30 minutes before stuffing . Softens the casings , but maybe there's another reason for it .
Drying before adding smoke makes a big difference too . I'm guessing you'll pick up some smoke after they sit a day or 2 .
Peel the casings and hot smoke as suggested above . I've done that in an MES 30 . Set to 200 and took the sausage back to 152 internal temp . Doesn't take long , just keep an eye on it . I had wood chunks on the element .