Go to your farm and home store and buy a 40lb bag of stock salt, and a 40lb bag of trace mineral and then if you want you can get Dicalcium phosphate. Dig a hole or use a tiller like I do and mix up the dirt in about a 6'x6' area. mix in the salt and minerals together. You'll have a good mineral lick now. I don't worry about getting the ratios right, but there are many "recipes" you can use that require more of one thing than the other. just Google it. I have found this works the best even more so than corn- especially in the spring/summer/fall months. Now once late fall and winter hit, they will want corn, corn, corn! they will hit it harder than anything. Try to let the mineral lick stand for 2 weeks or more. Sounds to me like you are frequenting the area too much.
I know when I tried the peanut butter thing, I left it for over 3 weeks and it wasn't till after a week that I got any pics of bucks eating it. Coons sure liked it though! lol
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!