100 Billion cells in one smack pack. According to Mr. Malty, you needed 257 Billion cells or 3 smack packs to achieve that or
use a 3.5 liter starter and one smack pack.
you did underpitch. May get some fusel alcohols and esters from this one. Stressed the yeast. Any chance you fermented at a lower temp - just want to make sure your controller is working.
I am running some batches with 5 smack packs (insert WTF here), just to see if the esters I have been getting from one smack pack go away. They did, as to be expected, at quite the added cost.
Time to upgrade the brewery with a stir plate and starter equipment...........