Hi there, if anyone has any advice I would be greatly appreciative. In two weeks I have fired two separate pieces, both strip construction, both have cracked along the strips after slumping. I fired them both at 300 DPH to 1200, 2:00 bubble soak, then 600 DPH to 1500 for 20 minutes, AFAP To 900 for two hours, 100 to 700, then cool down to room temp. They were than slumped at 200 DPH to 1205 for 20 minutes, AFAP to 900 for two hours, 100 to 700, then cool down to room temp. Both are 3/8 of an inch thick. I am using a fairly new Scott GM 1414 count on 1 inch thick kiln shelves on 4 inch posts. Both cracked quite severely along the strip lines on the undersides Only. I have tried attaching photos but it says the files are too big. I have fired many other strip construction pieces successfully, including other pieces in both of these firings… I am losing my mind and just about ready to give up glass entirely. If anyone has any thoughts or advice that might be helpful I would be so grateful. I have examined every possibility and cannot come up with a single explanation. This actually happened another time in April, but I had numerous problems with some myrrini pieces cracking at the same time, and I thought it might have to do with overfiring of transparent orange and yellow’s. But in hindsight those cracks were in the black and the same cobalt blue that just cracked in this piece. Both slumping molds are seemingly perfectly primed... Help me please!