Any chance that your a picking up phenols or chloraphenols in the brewing process. Yeast issues and or using city water can cause a plastic like off flavor/aroma that could be the culprit. Other that that you can take out the check ball and retaining clip and see if the situation improves. Just fair warning, removing that ball and clip will cause beer to leak out when tapping/untapping and/or cleaning. It is not much but just beer aware and keep a bucket and rag around to keep it under control.
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