I recently bought a Nostalgics KRS2000. Its my first kegerator. I have been buying 1/4 kegs of bud. It took awhile to get things adjusted. However most of my last barrel turned to foam and went flat. Temp is 38-40. Pressure has been about 11-12. The beer seems mostly clear as it leaves the barrel but turns to foam as it gets near the tower. I also going thru more C02 than I should. Any suggestions? Thanks in advance.