I opened it up this afternoon to find that both items that I had in there were fine. Maybe the temperature reading was incorrect and my placement of cones was incorrect… if would appear that the required temp of 1250 minimum for the white glaze was reached for the glaze to mature the way it did?
I have ordered new parts for the kiln sitter as one of the little metal pieces was missing so will keep tinkering with it. Even if I only use it to bisque, I think it will be worth it.
Thanks for your replies.