I'm giving my first starter a go: a 2.4L starter for a 21L batch overall. Since this looks like it will account for over 11% of the total volume, should I recalc for a 23L / 19L batch? Or should I keep the recipe for a 21L batch but only add total 19L before the starter?
The gravity will likely be quite different. I haven't measured the starter but assume it'll be around 1.040. The starter is made from straight LDME & the beer is a Saison, targeting about 1.071 OG.
Are there any other "tricks" for using a large starter in a relatively small batch?