Hi Molly, if your starter is doubling within 6-8 hours after a feeding, that is a good sign that it is ready and able to do the work of rising your bread. As far as flavor goes, you may want to consult our 3 part series on How to Make Your Sourdough Bread More (or Less) Sour. There's a lot of material here, but check out part 3 for some tips on how to develop more sour flavor in your bread, and a list of our recipes that are more likely to deliver sour flavor. 

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