You would hit the chain on the top down under the chain guard?The hole in the center of the sprocket has tolerances, the shoulder, (where the sprocket lines up) on the sprocket carrier has tolerances. I use to turn the rear axle to the tight spot in the chain, put a piece of wood on the back edge of the chain and hit it with a hammer. No more problem.
What gears do you recommenedI have noticed the red gears make this problem worse.