Even at 52 and with one of the greatest records in bowling history, Norm Duke always is looking to get better — although that gets harder and harder as you age. Duke, who earlier this year captained his Dallas Strikers team to the PBA League title and anchored the team’s Baker format 300 game on ESPN, led Monday’s Viper Championship qualifying  of the PBA50 Treasure Island Resort & Casino World Championship presented by Storm with a 1,215 total on games of 258, 245,...