I mix KBlue & lump in my WSM with great results. I pour a double layer of KBlue briquettes first and press them down. Then, I add wood chunks and lump to cover the KBlue and leave a slight indent in the middle to pour in 15-25 lit KBlue briquettes to get the Minion burn started.
Since I started cooking most everything @ 275°, the lump helps keep my WSM at that temp easier than just using KBlue alone.
Traeger Lil' Tex Elite, WSM, Green SS Performer, 22" OTG, hyperfast orange Thermapen. CBJ.