What are you trying to record with the '57? I assume you are plugging the mic into the XLR input. As mentioned, the XLR's are configurable as either mic or line level. You need to double check the jumper settings on the card. See your manual for details.
Acoustic guitar, I assume. -9dB is a perfectly fine level. Dynamic mics do not have very much output voltage. I doubt that your card's preamp has a lot of gain either, probably 45dB or so max. To get anything more, you will need to use another preamp that has more gain, or a hotter mic.