#1 you changed their feed and their method of receiving it. As was stated you want to start well in advance of the season your procedure on baiting.
#2 deer know better than we do just what they need to make it through a winter. They will graze the new grasses and hit salt/mineral licks in the spring and into the summer. Then they generally tend to shy away from lick. Acorns are a big part of their diet and it is hard to break what has become habit for them. Chances are they will come back too your feed when thay have had their fill of acorns.