You are leaving something out then. Which you allude to.

Bravo on five years! I recently solved a problem that took me over 30. I originally thought, 3-5 months maybe, then 3-5 years, ... I am happy it didn't take 50. I have killed a lot of my own darlings.

Well apparently you know what you are doing, I am sure you have something.

I have found the best language models are great at attacking things. You may have already done that, but if not its worth a try. Free brutality.