I have tried 0-16 with 20 gain, and it didn't help much, so I decided to go faster with more gain based on @wittaj 's settings. Exposure comp isn't meant to do anything when you're running Manual settings. It will make changes in some firmware, but all it is doing is adjusting the exposure and gain, so you might as well just make the changes yourself.I am certainly no expert with nighttime settings, but you may want to try a slower shutter speed. I would see what 0 - 5 or even 0 - 6 looks like for night combined with a slightly higher exposure comp setting (like 55 - 60). If that doesn't work, my guess is you may need additional IR light.
This camera does not have smart IR.