We have a similar issue. The second disc in the hopper would slide over the front of the bottom disc, creating a jam up in the exit slot. Our hopper is rolled .080 Aluminum with an outside diameter of 11.50 in. We placed some duct tape at the rear bottom going slightly up the rear hopper wall. Bascically smoothing out the corner between vertical hopper wall and bottom. This causes the bottom frisbee to slightly push forward through the exit slot. This in turn allows the rest of the stack to follow the same path and shoot freely ( for us anyway) . The duct tape seems like a weak fix, but it works and we may keep it.