I brewed a few weeks ago and put an ale into a corny keg. It's at 35F and 9psi. I had it there for 5 days or so, and it had only a few fat bubbles in it when a pint was poured. I allowed it to sit at 9psi for four additional days and now it spits out of the keg with a ton of tiny bubbles that dissapate very quickly, making for a lot of head but it appears to be uncarbonated underneath.
Does 9 days under those conditions mean it's most likely overcarbonated and I missed some magical window at which I should have stopped and consumed the brew?