Just finished my first glaze firing in a manual/kiln-sitter electric kiln. Everything went fairly well, except that it appears to have under-fired.
Used a 5, centered on the sitter, and self-supporting 5 & 6 near the center of each shelf. (3 shelves) The sitter cone seems to be bent correctly, to approx. 90*, but there is almost no bending in any of the witness cones, and some of the glazes are nowhere close to the expected colors. (Various PC glazes.)
Is it unusual for the sitter to register a full cone higher than the rest of the kiln ? Based on the #5's just barely starting to bend, I'm guessing I pretty-much fired to ^4. (and wishing I had put 4-5-6 instead of just 5-6 on the shelves, so I wouldn't have to guess).
I'm considering re-firing the same load, with a 6 on the sitter - but not sure whether that's a good idea, or if I should wait 'til I have some more stuff ready to fire.
Would appreciate any insights from those that have already been down this path.