I kegged a stout about 10 days ago, I don't have room in my keggerator to force carbonate it at a low temperature so it's sitting in my basement which is typically 55-57 degrees. I looked on a brew kegging chart and saw that at that temp I should put it at 10 psi. It is barely carbonated at all, but has a head when I pour but it quickly goes away. Any suggestions on this?