RE: Standing corn.
I hunt a lot of standing corn - one observation that I've made over the years is that when the corn is standing, the deer seem to feel a heightened sense of security, so they don't necessarily go as deep into their bedding areas as usual. Particularly when the foliage is still heavy.
There have been times where I've bumped bucks out that were bedded barely inside the edge of the woods, as I tried to slip in and get set up.
Focus on the travel corridors between the corn and the beds. If you have lanes of corn that only intersect thewoods on one side, pay attention to those areas, because they tend to prefer to stay inside the cover of the standing stalks, so they like to travel accordingly. If you can get into a position to glass, and can get onto a buck while he's still on his regular feeding pattern - you could set yourself up for a very productive opener.