By just three points, Cole Custer wins the regular season championship. He went out and won the race, making sure he won the championship, too. That means Custer is in a great position to win the NASCAR Xfinity Series title for the second year in a row. Cole Custer is moving up to the Cup Series once again. Before he does, he is planning on going out with another big trophy at Phoenix. The 15 bonus playoff points will come in handy in that quest. Bristol is special. Dale Earnhardt Jr. was in this race. The lights bring out the best in this Xfinity field. To close out the regular season and win…