Powder coating oven????

deg is way too hot. there might be a way to reduce the temps though.
look in the kiln and see if the elements are coiled wire, if so, you can reduce the nember of elements in the sides. you can also add a rheostat if you want. there should be 'gloryholes' in the sides as well, leaving them out will help reduce the temps. Make sure you have an accurate thermo, going from a good temp to burning stuff up is a small window.

my mom fires clay pottery and such, one of the first kilns she got had to have all of the nickle chrome elements replaced, very expensive. BTW, the elements brcome brittle with age.

hope this helps.

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