When |pma| > |pmb|, the positivity or negativity can be determined with 100% accuracy, but when |pma| < |pmb|, errors occur in determining positivity or negativity. I am looking for someone to collaborate on this issue.
1. There's no such thing as a negative public key or negative private key.
2. There's no relation between the bits of a private key and the bits of a public key, otherwise ECC would be broken. Your code fails the very fundamentals of how ECC works.
3. You have errors because you wrote that bunch of code without understanding what ECC is all about, and so of course you get errors, since it doesn't make sense even before you would write it on paper as pseudo-code, let alone as a Python script.
4. It works when |pma| < |pmb| because this is how you created it to work (as it doesn't really respect ECC fundamentals, rather some dubious creation of strings which are definitely not repsecting the correct private key to public key relation); hence, since it is written in such a way to produce results based on what you wanted it to do, what else would you expect in the other cases? Magic?
5. Good luck on finding a collaborator to help you fix the "errors".