I have the same problem, This is my first run at kegging so I expected a ton of problems and so far I have hit them all. I carbed at room temp waiting on all the parts for my keeper, after about a month of conditioning the keg went into the keezer (regulator has been at 14psi the entire time)...
We are talking about a business that is based upon supplying products to customers, failing to do so is bad business. And blaming lack of stock on the holidays a month later is not acceptable.
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I'm pretty sure my kolsch came out with similar flavors and I have narrowed it down to oxidation...but my question is why would some bottles taste great, some taste soapy and some taste like sour grapes/soy sauce (not to hijack your thread)