David,
With an oven temp of 400 dgrs, the cooling fan probably won’t start or run for quite sometime. You’re sure the thermostats are installed properly and in the correct position( hi limit is mounted closer to the front, the fan switch is closer to the back of the range). and are both rated witin 10 % of the original parts. You could try this, but be careful, Insert a very thin spacer(1/32 or 1/16 in.) under the thermostat mounting tabs, and see if it takes longer to open and shut the range control down.
Good Luck,