Ahhh, yes. I seem to recall reading you posting about that "little secret" before, but it didn't make sense to me when I saw it before, It's starting to click in place now. I'll have to go back and check my notes, but I think it will account for the variances I'm seeing.
You see, my wife likes more session-type beers, and we're always a bit high when we brew for her. I prefer stronger fare, and we seem to always fall a bit short when we brew for me. Given that we do the same thing, regardless of who's brew is being made; I've been wondering why we can't get consistent efficiency numbers. We've both been a bit disappointed in the apparent inconsistency.
Thanks, glad to see you back!