Bubba Wallace will not compete for a NASCAR Cup Series championship this season as he missed out on the playoffs in the final race in the regular season. After the Southern 500 at Darlington Raceway, Wallace spoke to NBC Sports about what caused him and his team to not clinch a playoff spot. “We got behind on adjustments. We were back and forth on our US Air Force Toyota Camry,” Wallace said. “A little too loose, a little too tight That caution with a couple laps on tires where we stayed out, I don’t know if that was the deciding factor. We just got so tight there and got back there in traffic…