If eggs don’t release well, it’s not seasoned well, most of mine are pretty nonstick but I struggle with the biggest one, the surface is not as good.

I would say baby that one. Clean it immediately then dry, wipe some oil in, almost none, and heat it while wiping it. Or make pancakes, that seems to rehab them. Long slow cooking with fat in there and something that doesn’t want to stick, getting scraped often.