Here's what I would suggest doing. If you can afford it buy a trail cam. You can get a decent one from $99 up to $200 Stealth Cam 2.1 and put it over your corn pile. Unfortunately its getting close to the end of your season but you still have time. Make sure you get a digital cam so you dont have to go through the pain of having 35mm pics developed, its worth extra money trust me. If you cant afford one see if you can borrow one from a friend for a few days. This will tell you what time the deer are visiting your corn, obviously they are hitting it at night but the cam will tell you exactly what time. I would definately say to move your stand close to a bedding or just move it to another spot period being you have hunted so long and not seen deer. I have the same problem with my corn pile, I get lots of pics at night and hardly any during daylight but I dont hunt over my corn because I know they dont come in until after dark typically. Moving your stand to a different type of area is probably the only thing thats going to get you a shot at some deer. Get in some thick stuff if you can.