Talk to me about granite stones. I have a bunch of granite bricks in the yard so may have to wash one off. What are the dimensions? Are they placed in the bottom or on a rack?
Any thermal mass in the bottom helps slow down that hi-lo effect (hysteresis) found in modern ovens.
It takes a little longer to heat up and cool down, but my oven varies by less than 10F rather than the normal +/-50F.
/johnny