We've been doing carriage rides every weekend in November and December for the holidays. Last weekend my team started spreading apart as they were pulling. It got to the point where the traces rubbed the hair off of their legs and the snaps on the breast straps were bent. I've used the same harness, collars and lines the whole season. I tightened the inside check lines, hooked them closer to the carriage and checked them for sores or knots on their shoulders. Nothing seems to help. I generally drive with a fairly loose line as this team has soft mouths. When I try to tighten the lines to pull them together, they just turn their heads towards each other and still lean away from the tounge. Has anyone ever had this issue?