I've done three more firings in the big DaVinci with the new lid, one bisque and two cone 6. All were very successful. The lid only sagged an inch during the cone 6 firings, and came back up to about 3/8 inch when cool. Some of the bricks are starting to loosen up just a bit, so I'm going to have to tighten everything up before tonight's cone 6 glaze fire. I also put new elements in this week, so the kiln is like new!