If You go on the 90 Acres too much You may be scaring the Deer off your property and they only travel on it at night,try to keep your activity to a minimum and leave an decent size area alone for a Sanctuary where the Deer can go or bed down undisturbed and no one is allowed in that area unless to retrieve a downed Deer.If You are checking trail camera's try to keep your scent down even when your not Hunting and wear rubber boots.Any unnecessary presence can keep the Deer wary that they are being hunted and You could be educating the Deer more and more,any 4-wheelers,dirt bikes,stray dogs or even tresspassers could cause Deer to be more cautious too!