My LHBS is awful, and I don't feel like ordering more yeast from Northern Brewer unless I want to tap into my kid's college fund to pay for express shipping.
With a 1.4L / 2 vial starter, would you suggest I decant, add 500 mL of fresh worth into the slurry, then put that on a stir-plate for a few hours the morning of the brew-day?
*** sorry for hijacking the post and making it all about me ***
do you have the ability to make 2(two) 750 ml starters? if so I would do that, decant, pitch half of your original starter into each and then proceed as you suggest.
growth is partially dependent on starting population and if the starting population is too high in relation to the volume of the starter you get poor to no growth.