MX
Some may call me....Tim?!?
I bake mine at 450 for 35 minutes with the lid on, then 10 with the lid off until it's the color I want. I also temp the loaves and they should be over 200 when you pull them. If you're wanting it to be more sour, the longer you cold proof/leave in the fridge, the more soure they become.
What's your recipe? Mine is:
325g water
120g starter
500g flour (I use the red King Arthur. Just don't use bleached flour)
17g salt

The Fold schedule is wrong on this version, they are every 30 min 4 times total