camera angle and settings

WDR and DNR are part of your daytime problem as I mentioned. I would:

Day
Turn off WDR
Set DNR to 35
Set Bitrate to 8192. 2048 is too low
Set Iframe to match FPS

Night
Set Bitrate to 8192
Set Iframe to match FPS
Increase HLC to 75
Drop DNR to 40
Gain 60

I leave all image settings at default along with Iris (50) getting bitrate, Iframe, exposure, and gain set, THEN tweak those. Too many setting changes all at once

Thank you! Daytime captures are already way better and consistent.
 

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I'd still zoom in further if it were me
 
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Looking good! Figure out where you want to focus, and pick that spot. Then you may zoom in, may not. in pictures 1 & 2, the vehicles are closer than #2. Not sure one is better than the other, but the camera looks to be focused on #2, not on the other two, although they are very readable. Remember, goal is a single shot of a license plate!