A little late on this. I did this sirloin tip roast (4.7 lb) on NY's day in the 055. Cook temp of 225, removed at internal temp of 120. Rubbed with Rosemary/garlic mix, montreal steak, and granulated garlic. Put some Rosemary/garlic in the wood box with 2oz Apple and 2oz Hickory.
Taste was superb. A little tough but we like it rare and it's not going to be tender at that temp.