I highly recommend calculating your efficiency by hand. For each grain, just take the amount used and multiply by it's respective potential extract. Add all these values together. Now, take your actual gravity points (which is (1 - G) * 1000), where G is the gravity and multiply by the volume of whatever your measuring the gravity of (boil, fermenter, etc). Then take that number and divide by the first number you calculated, multiply by 100 and you'll have your efficiency for whatever step. For brew house efficiency, it's simply SG going into the fermenter after adding top off water divided by potential extract. Hope that helps.