Great question, Kim! I wish I had a better answer for you than “I don’t know”.
The goal is to have the oven at exactly 450 degrees F before putting the full pot inside. Perhaps if you boosted the temperature to 460F 5 minutes after putting the pot inside to get the oven back up to temp that might equal 450F?
I wonder if you played around with your oven and an oven thermometer a little bit you could figure out how to make it work.
Let me know if you figure it out!