I just bit the bullet and bought some Advancer shelves. I fire a 7ct L &L in an outside shed. Its about 30 outside and I'm concerned about when I can open the kiln. I am in the Christmas crowd when it comes to opening. I try to fire early in the morning so it will fire all day when I'm around and then cool all night & I have no choice but to go to bed. Anyway Advancers are subject to cracking with uneven heating or cooling, but ALL of the references to this come from folks use large gas kilns, you know with dampers and such. Anyone here use Advancers in the electric and how do you ha