Denny Hamlin would be the first to admit that he and his team have not been firing on all cylinders since the NASCAR Cup Series playoffs began last month. Yes, Hamlin has done enough to this point to be one of the eight drivers remaining going for the championship. But in terms of speed and situations such as pit stops, it has not been a buttoned-up operation for the No. 11 team. Kevin Harvick, speaking on Tuesday’s “Happy Hour” podcast after Sunday’s Round of 8 opener at Las Vegas, expressed his concern for Hamlin, which he has previously voiced. CLICK HERE to go to PrizePicks and use code ON…