I would leave it be. You are combining 12% corn. So next year you will have 20% corn and have to undo whatever you change this year. You sample does not look bad at all.
IF you are getting mostly whole cobs then opening the concave more will not help you any. Slowing the cylinder down may help you. The reason I say 'may' is that 12% corn will crack with everything set perfect.
Unless you are doing hundreds of acres I would live with it for this year. In more normal moistures you would never need that real slow speed sprocket again.