After nearly 50 batches of brew, I finally experienced what I believe to be a stuck sparge. I batch sparge, so usually this isn't an issue. I did close my mill a bit this batch, and my eff went up about 7 points! All I did to in-stick the sparge is close the valve from my MT, stir the grains, vorlauf, and voila! Worked like a charm.
Anyone else ever experience this?