Hi EA, the reason we say to cover the starter loosely isn't because the starter needs air exposure in order to ferment, but because fermentation gases can build up in a tightly lidded container and cause the lid to pop off. It is important, however, to protect your starter from drying out on top, so it's fine to put the lid on loosely, or cover the top of the container with plastic wrap. I find a towel or cheese cloth doesn't provide adequate protection, especially when the air is very dry. You can send a photo of your starter to customercare@kingarthurflour.com. It's hard for me to say if your starter needs more flour. Are you feeding by weight? That's the best way to insure that your starter is the correct consistency, but a little flour more or less isn't going to cause any real harm. 

Barb

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