I've been coming up short on the batch sizes. My batch today came up a 1/2 gallon short. My measured mash efficiency was 85%. Cool. My measured brewhouse efficiency was 74.9. So I guess my question is, what should I fix? Should I assume it is excessive boil off? Doesn't make sense since I hit my gravity readings. I dunno. Should I change beersmith to reflect the 74.9 (75) so that I wind up with more than my target batch size? What am I missing here? Thanks for your input.