Clearly this was not an issue when everything was in my cool basement or here over the winter with my garage being plenty cool. FTR, I am using the rigid, hard plastic beer line (BevFlex Ultra or something?), not the softer and thicker stuff. I have no issue just running an ounce or two out of the line when it's warm here. I just started noticing this flavor in the past week with temps starting to rise. It was 100° here yesterday and approaching that again today. I will look into the cooled PVC and see how easy it would be to introduce to my system. I think there is 12" or less of line between the keg and the shank.