I think the focus is fine, since during the day, the image is very clear.What does the easy focus do .. or how would it impact with your focus issues? Page 13 in the manual .pdf linked above? Is your AF Peak close to your AF Max value?
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I applied the changes offered here, waiting for a few face pictures to be captured (less people are walking at night due to the cold weather), I cannot test it myself since i'm far from the cameras for a while.