Finally found some tri tips, and had to try Morro Bay Rich's recipe.
Here is the sear:
Sliced (pulled at 130 since the kids don't like it too rare):
Everybody loved it. Even the picky 3 yo had seconds. The 8 yo said it was the best steak ever, and my 10 yo carnivore girl loved it.
Here are the kids with a neighbor. Note the 1" of ruler sticking out. We had freezing rain, so the snow was so hard the kids did not break through.