Try turning down the 'MAX GAIN'. SETUP/IMAGE SETUP/EXPOSURE MODE-MAX GAIN. The default is 24. I set mine to 3. 
I'm going to say thanks to this post.
I had to remove my 2132L from my secure location for 1 day, and I tested it next to my DCS-2230.
It was severely washed out compared in daylight compared to crisp DCS-2230 image.
I didn't play around much, since I could remount into my secure location - I turned my gain down a little and my picture cleared up even more.
In my situation, max gain on exposure mode of "night", and brightness = 2, I'm getting better images.
contrast=4 , saturation = 0, sharpness = 3.. denoise =1 ( I don't see any changes if I change this).
The dcs-2230 max gain - isn't as much of a stickler. It's on 24, no issues in daylight/nighttime, and I only notice in nighttime a slight difference between 0 and 24... (brightness on
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.
My 10 minute test is not conclusive of anything for sure... but the image on the 2230 is so much nicer without issues.
I can even see a planet or 2 sparkle in my light plagued area in the sky....(with brightness=8 max gain=24).....2132l/5222l would not even come close.