Grays’ Kolby Landon (10) greets Boston Ross (22) at home after Ross’ three-run homer during Gate City’s 12-2 victory over the Brigham Peaches Friday night at Halliwell Park. The Grays took both ends of a doubleheader, outscoring the Peaches 30-2 in the two games. | Kyle Riley, EastIdahoSports.com POCATELLO — The Gate City Grays put an emphatic end to their three-game losing slide Friday night, sweeping a doubleheader against the Brigham Peaches.…