I was going to do a HnF brisket this weekend, but I'm in the mood for something different - I'm thinking of doing a tri tip. My thought would be to cook it direct at 350-deg. Am I crazy? Do I get too much radiant heat? I guess I also am not sure how long it would take either .. i would think a 4-5lb piece would be not more than 45 minutes or so. I'll be using a thermmometer, but I am just trying to gauge timing.