SAN DIEGO — Jurickson Profar turned on an 87 mph change-up, jogged two-thirds up the first-base line, watched his drive bounce off the top of the wall in right field and flipped his bat as he screamed toward the home dugout. The margin of error for MacKenzie Gore, even in the best start of his young career, could not have been much thinner. The rookie left-hander struck out nine over a career-high seven shutout innings and Trent Grisham picked up another shaky bullpen effort, walking off a 4-2 win with a home run that clanged off the right-field foul pole on Sunday in front of a sellout crowd …