I brew extract w/specialty grains and bottle. In a recent batch of Cascadian Dark I had an OG of 1.071 and FG 1.013. It was in Primary 14 days-Secondary 10 days. I used only 3 oz of priming sugar at bottling. It's been in the bottle right at 2 months. When I open the bottle I get the normal spritz sound...no gushing, no foaming, no action.....UNTIL I begin to pour into the glass. Then I get excessive foaming that requires great patience to get 12 oz into a pint glass. It is definately over-carbonated in mouthfeel, as well. Does this sound like an infection/sanitation issue...or are there other components I should consider?