Force Carbonation Chart - Kegerators.com
Stouts and porters, 1.50 – 2.20 volumes CO2
At 56F and 10 PSI, you are at 1.72 volumes. You are on the low end of the scale.
You can go up to 16 PSI and be at the higher end. Make a couple of pound adjustment and wait about a week. The gas...