I put two IPA's in a couple kegs at serving temperature of 40 F. They smelled pretty good from the hydrometer samples beforehand, but now that their fully carbed, they have a weird rotten melon, raw dough smell that kind of ruins them for me. One keg had two ounces of Centennial and two ounces of Citra. The other had two ounces of Apollo and two ounces of Centennial. I put them in a sanitized hop sock. Anyone have any experience dry hopping cold? Could this put off weird aromas?