I'm not really assuming any of the above, I don't have a clear idea of what you mean. Probably would be better to talk in person and draw a picture for each case. Too hard to do in reality.
2) If you are getting fret buzz when fretting between the frets, it means your action is too high.
Overall what you seem to suggest is that if you have a slight buzz when pressing in the middle of frets, then the action is too high and you should lower it. In practise this doesn't work on my guitars. I have found the opposite to be true. I have never had a problem with fret buzz on the fret that is being used, its always a few frets away from that.
"When I was younger, I could remember almost everything, whether it happened or not." Mark Twain