I'm currently drinking my pumpkin ale that I brewed a while ago and used the Thunderstruck recipe from the forums here. I'm getting a slight metallic flavor in the foam/head that fades once the foam dissipates. I do get slight head retention that stays on the surface of the beer that looks clumpy but doesn't have the off metallic flavor that I get when there is a 2-3 finger head on the beer. This was the first beer that I carbed with the 30psi for 2 days and then brought it down to serving pressure after that. The beer does seem to be a tad over carbed so I'm wondering if the metallic flavor could come from being over carbed. The beer tasted great out of the fermenter and didn't have the off taste. Thanks in advance.