you could try hanging a cam on the feed spot and see if they are feeding at night...it could be pressure , i don't know if your the only hunter in that area ...but enough pressure can cause habit changes , that and the weather.
aslo i don't see anydeer on my feed areas cause they are eating acorns , why would you drive to mcdonalds for a cheese burger , when theres a steak in your kitchen that just came off the grill......deer in my area won't touch the corn untill the acorns are gone , and they won't have to travel that far in most cases to get from their bedding areas to teh acorns...they are a plenty everywhere.