Try doing everything completely different. Set your alarm for 11:00 pm instead of 4:00 am. I've found that if I'm hunting when big bucks actually move I have a lot better luck. I've also found that most guys sleep right through prime time and never get to pull the trigger. With a lot of gas in the truck and a little help from a good buddy holding the light you'll get that buck!! Thats how everyone does it down here in the Ozarks