LAS VEGAS – Clayton Carpenter may now be a UFC fighter, but he’s not happy with his performance. Carpenter’s entertaining back-and-forth battle with Edgar Chairez at Dana White’s Contender Series 49 on Tuesday left him with a black eye, but he was able to rally using his grappling to earn a hard-fought win and a UFC contract. Carpenter (6-0) came into the fight having finished his past two opponents in less than a minute and was disappointed to let the judges get involved. “I let it get a lot closer than it should have,” Carpenter told reporters, including MMA Junkie,…