Slight lean condition on right cylinder

[dag8501]

As the title states, I am running into a slightly lean condition on the right cylinder according to the spark plug. My alcohol-fueled cub motor is calling for the right-cylinder power jet to be completely closed while the left-cylinder power jet is only one turn from completely open. With these power jet setting the spark plugs read identical. These are the things I have check when troubleshooting: Cleaned the carbs and swapped sides, swapped sides with the spark plug boots, leak-checked the motor (held 7 in. of vacuum overnight), and changed the spark plugs multiple times. What am I missing? Could bad reeds cause this problem?