Let me summarize your amazing discoveries, and also help you find the full keys:
In every single puzzle the position of a leading bit "1" is hard-coded into the key. This information creates a pattern.
This explains pretty much all of your discoveries, but unfortunately this is something we already know.
Maybe subtract the range start from your decimal keys so that you actually have unbiased data to work with. Let us know how well your circles and shapes and columns of digits work for you after that.