Some background: my lighter beers had been finishing with a horrible off flavor, like bandaids but more astringent. I got some great advice here about water chemistry, but that wasn't it. I made some terrific light IPAs last year with plain tap water that had no issues. So I scoured the Internet for more answers, as well as my notes. Like many of us, I can get in a hurry on brew days with other things needing to be done. I'd been chilling my wort (with an IC) down to what only FELT like the right temp, literally testing it only by feel. Yeah, I know, stupid mistake. My last batch (10 gallon amber), I made sure it got down to 72 before transferring, and didn't pitch until it was at 68. I just kegged it this morning and it's fantastic.
So, moral of the story: DON'T SKIMP ON CHILLING. EVER. It may not seem as important as, say, sanitation or fermentation temperature, but pitching yeast too hot WILL affect your final product, often negatively.
So, moral of the story: DON'T SKIMP ON CHILLING. EVER. It may not seem as important as, say, sanitation or fermentation temperature, but pitching yeast too hot WILL affect your final product, often negatively.