Sounds like you need some supplemental flash. With the aperture so small, you have to pump in some light to get a good exposure. Since you have a hot shoe, I would reccommend getting a hot shoe flash, you can probably get one pretty cheap. Then something to dampen the flash down a little bit would probably help, try some cloth or tissues. Then experiment with flash and aperture (I can only go to f8) as well as ISO (the higher, the easier for low light exposure, but also more noise). Anyway, just play around. But supplemental light is what you need.