Really appreciate you taking time to share such detailed feedback, thank you!
I agree. Needs to be smarter, right now too much is based on the % of shadow filled compared to final shape full filled at 100% due to being fully in absolute correct position. Then there's how what looks to be the final shape matches up, but it's the mirror.
One fix would be to accept the mirror matches. The smart part show a more accurate meter will be a greater challange.
Next version will show how well these issues can be addressed.