Use what they can't get. I have several acres of corn and so do my neighbors, so even if I took all my corn off they can still find it in ample supply. They will however, still eat corn bait if they pass it. I use molasses in my corn to draw their sweet tooth, but I have never gone wrong with cut apples hanging in the apple trees. I keep them in the apple trees so it seem real enough to them. I also mix a paste of apple butter, peanut butter, and oats. I put oats in it to keep it from freezing solid when I put it on stumps.
We use apples also the trick we found was to put out only 3-4 apples each morning ,late in the day apples encouraged them to come at night and so did to many apples so we started just putting a few out every morning this gave us the best results.
When it comes to scent, there are basically two types; those that attract and those that mask. I've tried both on many occasions. There are lots and lots of "doe in heat" scents, designed to attract a big buck into range. I've also used a "cow in heat" scent while elk hunting.
Another scent would almost be better named as a "coverup smell". The main goal is to cover up human odor or mask it. Though I don't believe you can ever totally eliminate all human...