SAN DIEGO — Blake Snell was so much better, and then he reverted to being the guy who has struggled through the first half of both his seasons with the San Diego Padres. The left-hander threw strikes and generally made quick work of Philadelphia Phillies batters for four innings before hitting a familiar bump. The Phillies scored three times in the fifth inning and once more in the fifth against Snell, and the Padres couldn’t keep up in a 4-2 loss Saturday night at Petco Park. Jorge Alfaro’s two-run double in the bottom of the fifth for the Padres cut the deficit to 3-2, but they made 13 strai…