My first Tri-tip -- a little over three pounds, took a little over an hour in the PBC, pulled at 125 degrees, then wrapped in foil for 20 minutes. I used the following rub:
2 tablespoons finely ground coffee
1 ½ tablespoons kosher salt
1 ½ tablespoons granulated garlic
1 heaping teaspoon black pepper
1 tablespoon brown sugar
¼ teaspoon cayenne pepper
¼ teaspoon ground cloves
¼ teaspoon cinnamon
Sorry for the large photo, need to figure out how to post a smaller one.