Agreed with the above. Also I'd remove and inspect the liquid post (and poppet)for clogs. Like Steve said, hop particles can clog up the poppet/post. And I wonder too if the beer's overcarbed - at 35F and 9 or 10psi, you'd get 2.5ish volumes. Chris - I know you said even below 5psi it's foam, but where does he leave the pressure set ?