OK, if anyone cares, the force carbonation did overcarbonate the beer. When the keg had a leak, some carbonation did get infused into the beer. Then when I re-filled the CO2 tank, I jacked up the pressure even more wanting to be able to drink my 1st kegged beer in 3 days.
Then when I thought the beer was flat and tasted bad, I even rocked the keg back and forth for a few minutes. Burping the keg let out some pressure, but by 03-16-2013 all of the head was gone and the taste of the beer was so bitter that it was completely undrinkable. I poured out the last 1/6th of the keg.
Blue Moon Clone is now in the keg. Set the PSI to 10 and just waiting until it is ready. I'll never force carbonate again.