I brewed an all-grain English Oatmeal Brown Ale (NB's Surly Bender recipe) with an OG of 1.053. I racked (perhaps a bit early) after 8 days because fermentation had stopped. After another week in the secondary, it had not dropped lower than 1.020.
I contacted NB and after warming and rousing the yeast, they suggested pitching some more yeast. So I made a big starter of WLP001 for my next batch and pitched some into this brew. After another 9 days, it's only down to 1.019.
Did I mash too high and get too many unfermentables? Or is there something I can do to get the gravity down?