The bottom of my bread gets a little too brown for my liking. How do I remedy that?

Nancy's advice is good. Along with reducing the oven temperature, you can also try raising your oven rack up one slot if you can and possible adding a second sheet of parchment especially in the bottom to help distance your loaf a bit more from your dutch oven.

Could be caused by too-hot oven or too-conductive pan.
Suggest you reduce temp or use less-conductive pan.