I brewed an oatmeal stout about 6 weeks ago (recipe from the brewmaster's bible) partial mash with 8 oz. roasted barley and 6 oz. chocolate malt to 8 oz. rolled oats, 3 lbs. British pale, and a few lbs DME. Water was plain old supermarket spring water. Grains steeped 90 minutes at 150 F and...