You’ve gotten some good advice. I’m surprised your dough was sticky with the recipe you linked, but that’s not a bad thing. Maybe your starter was more wet. I’ve had good results with both sticky and stuff dough. I wet my hands with cold water to handle the sticky dough.
Let us know how it comes along!
I also like mine a bit darker, but this looks beautiful and delicious. I don’t have a Dutch oven, so I bake mine 45 minutes at 475F.