After living in Santa Maria I have used many spices. I have used tons of Pappy's. My preferences in store bought spice for tri-tip are "Susie Q's" made by Susie Righetti, who is the daughter of the famous BBQ legend "Clarence Minetti" who owned the "Far Western Tavern" in Guadalupe, CA. My second choice is "Jocko's" spice out of Nipomo, CA---Jocko's is one of the finest steak houses in California. My third favorite is "Santa Maria Seasoning" made by "Wagon Wheel Market" in Oroville, CA. The Butler family at Wagon Wheel Market descended from a long line of butchers that worked in Santa Maria, CA.
Do not get me wrong---I am looking at the picture of the sliced tri-tip, and see long striations on the surface of the cut----it appears perhaps that the tri-tip may have been sliced parallel to the grain----slicing perpendicular to the grain seems to be the biggest challenge when cooking tri-tip. We have all been down that road. Everything else looks superb---thanks for the photos and the input on "store bought" spices. Pappy's is an awesome spice---and can be bought anywhere.