So I will be brewing a triple IPA this Saturday with an intended OG of 1.089. I am using a pack of Giga Yeast Vermont IPA(the pack says it has more than 200 billion viable cells and was package just over a month ago). I will be making a two-liter starter(this is actually my first time using/making a starter) but will be manually shaking it because I don't have a stir plate. I am looking at all of these online cell count calculators and they say that I will not have enough viable cells even with my 2-liter starter. I have been setting my target pitch rate a 1 million/ml and the growth factor is coming out to around .95 to 1, depending on what calculator I use. Do you think I am fine or do I have to go back to the homebrew shop and pick up another pack of yeast and pitch it with my 2-liter starter?