Help please · Pottery People 💛☕️

Help please

So I did a bisque fire on my plaque for my sister and two things happened. It cracked through the middle and it also bent again. I did all the things suggested for the previous tile that warped. I used batts to flip it when I was rolling it out and drying it. I kept the weights on it and it was perfectly flat when it went in. Is there something I can add to prevent warping or strengthen the clay? This is the wild clay so I’m not sure if it is missing a key property to keep it flat. The crack is only on the front side - is there anything I can do to fix it?

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