I am getting a little frustrated with my Walker. Now that the leaves are falling, when I mow and want to pick up the leaves as well, it is leaving a windrow of clipped leaves that it spits out of both sides of the deck. It has a 48" collection deck on. I pulled the deck to make sure it was clean, I checked the boot attached to the rear of the deck for damage, made sure the deck vents at the rear corners of the deck we're clean and also checked the vent in the hopper. With about 50 percent coverage of dry leaves, I slow down to a crawl and still get bits of leaves that the blades are flinging out going forward from the ends of the deck. Any thoughts?