I am brewing a Wee Heavy this Saturday OG 1.081 5 Gallon batch, I picked up one vial of Scottish Ale 1728 which had a of date November 15th 2012. I first used Mr Malty and it recommended a 2.54 liter starter with stir plate. I only have a 2 liter flask, so I grew the starter from Sunday night to Wednesday then shut off the stir plate and put the flask in the fridge covered with foil.
Just found out about http://www.yeastcalc.com
, according to its calculations I need around 290 Billion cells for this beer but my 2 liter starter only grew around 264 Billion cells. This tool allows you to step up a starter, but at this point I could decant and feed it another 1 liter of new starter wort to get 388 Billion cells which would be over pitching by 100 Billion.
What do yall think I should do? Leave the 2 liter starter decant and pitch around 30 billion short? Or Step down the starter from 2 liters to 1 liter (which for some reason sounds like a bad idea but I do not know why).