Could have been dry rot on your regulator hose, too. Time for a banjo cooker or a Blichmann!
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And, given the styles I usually brew, I can stick to the early malt additions and not worry about this as often. Cheers!
before taking your gravity reading give the wort a thorough stir. it might also be advantageous to stir more when adding the late addition. even if it's not scorching to the bottom of the kettle you could be getting unwanted coloration if the wort near the heat is higher gravity than that near the surface.