Those Tri Tips look perfect! I agree with the 145° temp. I much prefer the texture of TT at 145° vs 135°. Have you done a “trisket” yet? That’s one thing I have been wanting to try for a few years now, but just never have.
Yes, I have done a "Trisket" and it was an unqualified success. Very moist and tender results. Sure is a lot easier to cook than a Brisket and to me tasted a lot better than a Brisket. Since there's only the 2 of us at home, it's a lot cheaper to smoke/cook a TRISKET than spend $40 - $60+ for a Brisket! I used a USDA Prime Tri Tip from Costo.
Smoked the Tri Tip at 225ºF for 2 hours till the internal temperature reached 140ºF ... double wrapped the Tri Tip in heavy duty foil and increased the pit temperature to 300ºF ... Removed the Trisket when the internal temperature reached 200ºF ... Rested the Trisket for 15 minutes before carving against the grain ...
For planning purposes only: Total time ~ 4 hours --> 30 min preheat / 2 hours @225ºF / hour & 15 minutes @300ºF / Rest 15 min.