Outside Coors Field, there is a banner that reminds fans that the Rockies are “here for the climb.” On nights like Wednesday, it’s also a reminder that the ascent out of the National League West basement is a journey that will be anything but quick. Colorado’s nightmare homestand continued Wednesday with the New York Mets planting a 10-5 defeat on the Rockies, marking the fifth straight loss since Colorado returned to Denver with plenty of optimism after a 4-2 road trip through New York and Cincinnati. All those good vibes, however, seem like distant memories as the Atlanta Braves posted a sweep of the Rockies to start the homestand and the Mets are threatening to do the same to close it out as well. What’s been one of the biggest reasons for Colorado’s struggles during this stretch at Coors Field? It starts with the starting pitching, which posted a 7.06 ERA before Michael Lorenzen elevated that number by giving up seven runs and 11 hits in five innings Wednesday.…