My last two beers have poured foamy the whole keg through. Even multiple pours in one session doesn't change anything. The head stays for a while too. OK. Here's my carbonation procedure. After kegging, I hook up to the gas side and fill and purge with like 10 psi a few times to remove any 02. Then the last time I don't purge to seal my keg. I then disconnect and connect to the beverage side. I then turn my bottle on and here gurgling. I slowly increase my pressure each time the gurgling slows to a psi of 30. I leave the bottle on and connected for 3 or 4 days. I disconnect and either let it hang out till I get around to drinking or put directly in my kegerator. I might add that all of this is done at a temp of 35F or so and I keep my kegs stored at this temp while and after carbonating. I serve at 7Psi. Any help would be appreciated.