Next kiln: Had tests. But no documentation system to learn from those tests. What a shame! Even if you are potter or hobbyist, it is always good to be testing something new. An oxide or stain added to a base (or a variegator like rutile or titanium). A new base clear or matte that fits your clay bodies better. A new stain or commercial glaze. A found-clay. A new body/glaze combination. But every time you test something new, be sure to keep a record (with notes, recipes, pictures) in your account at insight-live.com.
In ceramics, glazes and bodies have a chemistry, a mineralogy and a physical presence. All of these need to be understood to adjust and fix issues.