Jameson Taillon’s start to his four-year deal with the Chicago Cubs largely has been forgettable. A left groin strain and time on the injured list two weeks into the season spiraled into a five-start stretch that produced 21 earned runs in 17⅓ innings. Encouraging moments have been fleeting for the 31-year-old veteran, with the Cubs believing in his track record as a big-league starter with a career 3.84 ERA and 107 ERA+. “I’ve been just grinding trying to find it,” Taillon said Friday.