The Astros knew Chris Carter likely was going to be a streaky all-or-none hitter when they acquired the 26-year-old slugger Feb. 4 from Oakland in the Jed Lowrie deal. When Carter started the season 1-for-19 with 10 strikeouts, the Astros weren’t surprised. And as the 6-foot-4, 245-pound leftfielder’s rolled off a 9-for-18 run with three homers and five RBIs during his last four games, the Astros also haven’t been surprised. “It’s good to see Carter getting into a groove,” manager Bo Porter said. Carter’s only recorded 369 big-league at-bats in four seasons. But he’s playing everyday for the first time in his career and he could approach 30 home runs [...]