First biab. My volume calculator must be screwed up! Anyway, i boiled longer to get down to what I thought was 5 gallons. (15 gal pot). Ended up being just 4 gallons. But, at that point, my OG was spot on. But, I elected to top it off in the fermentor to 5 gallons before pitching. Which obviously messed up my OG. Should I have left it at 4 gallons at the right OG? Or ok to top off? Its a belgian wit. Thx for help.