Originally posted by honkey
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Help - Over Attenuation!
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I think that if you are attenuating more now than you were earlier, you may have yeast cross-contamination problems or wild yeast infection. Even single infusion mashing at 155 should yield an FG of about 2.0 - 2.5 on many beers. Chico ale yeast is a pretty good attenuator, but I've never seen it go that low in my brewery.
You said that you are managing four strains of yeast. This requires very careful washing and sanitation practises, and the risk of cross contamination gets higher the more types of yeast you have.
You should try fermenting your next batch with a freshly purchased pitch of yeast, but before that, you should run a very thorough clean out of all your tanks, lines, gaskets, valves, ports, man ways, etc.
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