Just an observation...you only used 8 lbs of grain. That's equal to 4.8 lbs of DME.
I know most DME recipes require 6 lbs which comes out to 10 lbs grain, LME calls for 6.6 lbs.
It apprears your yeast didn't have enough sugar to take it to its limit (75% attentuation) and converted more of the available sugar to alcohol which resulted in the lower FG.
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HB Bill
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