Help troubleshooting sourdough

Help troubleshooting sourdough

My wife recently has been trying to transition from using dutch ovens to our Subway fan oven to which I added a steam injection system.(I posted previously about it). The shelves are lined with ceramic tile as well as the bottom. When she has done it in dutch ovens it has come out prefect, Now as you can see from the photos it is not correct. She preheats to 450. Starts injecting steam about 10 before putting loaves to the oven then continues steam for about 10 min until they strt to turn brown. Reduces heat to 420 (which does not do a lot because the tiles keep the heat), open door to release stem, closes door then bakes until finished. Any suggestions to get this right would be appreciated.

 

Source: Fresh Loaf