Tips for darker crust?

Preheated pizza stone @ 550 for 2 hours then baked 7-8 minutes. It came out nice and crispy but would have liked to get the crust a little browner. Was concerned the cheese would burn too much if I baked it any longer. Any tips?

Preheated pizza stone @ 550 for 2 hours then baked 7-8 minutes. It came out nice and crispy but would have liked to get the crust a little browner. Was concerned the cheese would burn too much if I baked it any longer. Any tips?