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I have been having an issue with the bottoms of my pots getting big chips out of them during a glaze firing. The chipped parts are not really stuck the the kiln shelf, they brush off easily, so I don't think it's a glazing issue. Normally I dip glaze pots with clear and wipe off the bottom with a sponge. I wonder if a little residual glaze is still there and sticking? This is happening with my cone 6 porcelain (standard 365) and a black stoneware clay. Both have a high shrink rate. I do use kiln wash. Do I need to apply kiln wash for every firing? It seems like that must be the issue but on some shelves the wash is getting so thick that it flakes off. Should I be removing the excess and re applying fresh kiln wash?