Well, I certainly do understand your frustration. You have provided them a lovely home and good care, yet no eegs.
I think you are right to just give it a bit more time and a few minor tweeks. I sure don't see any glaring problems.
Best of luck to you... and your hens!!!
My neighbor has a coop and covered run that is oriented with its back side towards the sun. She has to keep a light year round because, while it is light enough outside it is too dim inside the coop and run.
Is here ample brightness inside the coop and run itself?