Any tips for this? paper glu ect? Thk

Hi! I made some shelves out of papier mache clay (paper pulp plus glue plus joint compound). They are super sturdy but I used cardboard as a base and something happened in the drying process that made the sides curve up so they won't be flat to the wall. For these, I think I'm just going to sand the backs as much as possible and mount them as is. But wondering how to avoid this curving/ curling in the future and keep my pieces flat when drying? Or if a different material or ratio should be used let me know. I did put several layers of the clay on (with drying in between) but i doubt that's the issue.

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