4MP Hikvision Cameras Ghosting Trails

I have done a bit of research about the ghosting trails on the HIK 4mp dome 2142 cameras which is what I have, apparently it is either a DNR issue or an Exposure issue, the exposure on these cameras is set to 1/30 by defualt, the environment is fairly well lit, however when I turn DNR down to 50 or below the night vision really suffers. When the DNR is turned up past 50 on the HIK dome I can see ghosting trails behind cars even during the day,I have even tried turning the 4mp camera down to 2 or 3mp does not help, should I swap these cameras out for some green line 2mp exir cameras should that solve the ghosting issues I having or is there anything else I can try to get a balanced day/night image?

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