Is the OG based on the 2.5g of Wort, or the Wort mixed with top off water before pitching? So e.g. the recipe says 1.084 OG, is that the Wort mixed with the 2.5 to 3 g of water or before? A lot of posters including myself have been coming up with a lower than targeted OG for some reason, but my beer seems strong as it should be.