Moon Photography help needed (OMD)

I'd suggest an even wider aperture. Mft lenses are often sharpest at f4 and the moon is 300 million meters away. So Depth of field certainly won't be a problem. Atmospheric distortions on the other hand may degrade the image quality quite heftily (depending on where you live). I also would not hesitate to use a slightly higher ISO-Setting for the same reason. Even if you use a tripod you'll have to find a compromise between noise and shake.