Not sure of your grain bill but if it was mostly pale malt I can see it easilt attenuating that far down with a mash of 148 degrees.
Brewing since 1989 - BJCP National Rank
Fermenting: Saison Autome, Cherry Mead
Conditioning: Dortmunder Export, Belgian Dubbel, O-fest, Vienna Lager
On tap: CAP, Cider, Impy Cherry Stout, Rye Dunkel Bock, Belgian Chocolate Stout, Hopslam! Clone
Newly Bottled: Belgian Blonde, Belgian Quad