Well you said that as soon as you start the truck you can see as many as 30 deer so you know they are there.

What I would do, skip hunting for a few nights, find and area where your visibility is as good as it can be, and just sit and watch. See where these deer may be coming out to the fields, see where they may be moving. Too many times just because it IS huntign season, we quit scouting and just hunt. I also agree with others that you may be using your stand too much. Many times people put up a couple of stands and think that is where the HAVE to hunt. Forget that, move around! Build some ground blinds move move move because obviously what you are doing is not working. Good luck to you.