Rick, this reminded me how I once did Tri-Tips on my Weber Kettle 8 years or so ago, taught to me by my Son in Cal. who had a Weber Kettle.
I would fill the
Weber Chimney with Charcoal, light it, and then dump into the Weber Kettle when ready. Next, I would put the Tri-Tip (s) on with the fattest side down and shut the lid with vents wide open for about 5 minutes and let it burn some of the fat off. Next, I would flip the Tri-Tip over, shut the lid again and go off and forget it for another 40-50 minutes, then come back and take lid off and Tri-Tip would be done. 40 minutes back for small Tri-Tip and 50 minutes back for larger Tri-Tip.
Shortly after that, I bought a Hasty Bake Grill and a Weber Wireless Probe and started using it on the Tri-Tips, but still used the same fat side down first method that I used on the Weber Kettle.