Everything looks good from your pic,
You might need to do testing one pin at a time to see if there are any issues with them individually. Try some of the unused pins as well. Although one thing I would like to ask, the chart in PA1, PA2 & PA3, why is there an immediate drop in the signal, then the gradual increase ? If you want to see if it is working correctly, see if the signal can start at 0 increase to max with a steady turn of the pot, then reverse back to 0 in reverse