I have been brewing Brewers Best kits for some time now, and have been within a reasonable range of their predicted OG. The last 2 kits I brewed were from Northern Brewer, and I came in high on both of them. I followed the instructions to the letter, and I even checked with a second hydrometer. The top-off water was mixed in thoroughly. Anyone have the same experience with Northern Brewer kits? Thanks.