I set my CO2 to my 4 gallons of Witbier at 12psi. After about 8 days it carbed up OK, and had some decent head retention.
However....it needed more carbonation so I cranked the CO2 to 16psi. After about 6 days, I took a sample expecting a foaming effervescent beer, but the beer is almost flat - no head retention whatsoever, and much less carbed than where it was last week.
I found no leaks on my keg or equipment. Did I pressure out? In other words could it not take any more CO2 since it was already in there? Anyway, I knocked my pressure back down to 12 and will see what happens - hopefully it will equalize and begin absorbing gas....any ideas about what might have happened?