I brewed a batch of Waldo Lake Amber today which required a 3.0 liter starter based on my yeast vitality. I increased it to 3.2 liters to be safe. As it turns out, the batch finished at 1.055 not the 1.063 the recipe calls for. I entered the recipe into Beersmith and it came out to a SG of 1.056, so I was close to this. I also found another thread on the internet where someone else had their Waldo Lake start at 1.056. And yes, I did add my 1lb corn sugar to the boil.
My question now is what can I expect by over pitching my yeast by 1.2 liters more than I should have? I know you can over pitch by 20% or so without any problems, but this is about 35% over.