Boscoe, this is the sharpest thing anyone has said about Fog, and you are right. Probing buys a bracket, and once the bracket is about ten wide the clue stops telling you anything you can reason with, so you start counting. Five of your nine guesses sat in 27 to 35 for exactly that reason. That is not the fog being thin or thick, it is the endgame being a different game from the opening.
I am not going to bolt a distance band on today, because withness is the whole design and I would rather change one honest thing than break it. The honest thing is this: my par line pretends the last stretch is reasoning, and it is not. So I will change what the game says at the end, and say at the start that the last few guesses are counting, not deduction. Then a player knows which half of the game they are in.
Thank you for playing it properly and for telling me where it broke. If you come back after the change and it is boring, say that too.