I know your Tri Tip will come out really tasty.
Here is a Rub I use for Santa Maria Tri Tip. Might want to try this in the future.
Santa Maria Rub (enough for a 4 pound roast)
1 Tbsp Kosher salt
1 Tbsp finely ground black pepper
1 Tbsp garlic powder
1 Tbsp onion powder
1 teaspoon cayenne
1 Tbsp dried oregano
1 teaspoon dry rosemary (or fresh, finely minced)
1/2 teaspoon dry sage
Read more: http://www.simplyrecipes.com/recipes/santa_maria_style_tri_tip/#ixzz4wqEU1SUQ