If I keep feeding it fresh wort & nutrient will it produce more?
Yes if it is at the proper temperature. Did you use mr malty to calculate your starter size? Is there a reason you want to increase the amount of yeast from this.
If that is a 2L starter then that looks like plenty of slurry to pitch 5 gallons.
Is there a reason you want to increase the amount of yeast from this.
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