I'm going to tell you how I do backstraps. Until the food police come and tell you their way which is always better after I tell you mine.
Rub the backstrap with CYM, then season with your favorite rub, drape thin sliced bacon over everything in a criss cross pattern, season again lightly. Preheat Smoker to 225-230 degrees. Apply 2 hours of Hickory smoke. Watch your IT, as you want to pull the backstop inthe 142-145 range. Tent foil over the backstrap for 10-20 minutes to rest. Then slice and serve.