When you turn your control knobs all the way in, you have now taken all of the adjustment out of it. With your knobs now, one knob is backing out 2 turns further then the other. This is why one is at 5 and the other is at 3. Each adjustment bolt was not put in with a CNC machine, but more like a center punch, this is the difference in the back out. When you turn the adjuster knob all the way in, they ( the shovels) will both travel the same distance. Max travel of the carpets is what your looking for and with your knobs (feeder bolt) turned all the way in, this is what you will get. If you would take the hopper off of the stove and look at the feeder shovels you would see that the distance for max feed is the same when turned all the way in. Your shovel adjuster will only go in so farand then it stops, but if you measure from the front of the shovel adjuster to the back of the adjuster , they are the same. Thread count does not mean anything, it is a variable. I know this is confusing, but it will work. Trust me.