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Being a less-than-tall person, I bought an L&L 18" deep kiln - I couldn't reach the bottom of the 27â€ers. Kiln works great, tho I have to add degrees to the cone offset for 04 bisquing, and remove some from cone 6, ( according to my witness cones). Actually right now Iâ€™m using the cone 5 setting and that seems to get my 6 cone to the right spot. My e28s has 4 elements and 2 thermocouples, and this creates some challenges. I get even responses from my witness cones only if I fire with only 2 shelves. With 3 shelves in, the witness cones vary widely. Iâ€™ve tried every variation on shelf placement I can think of, including staggering and using 2 1/2 half shelves. The manufacturer says that you need 2 elements and 1 thermocouple per shelf, and Iâ€™m pretty sure I also read that the shelves should clear the elements. With my kiln , that means you can only have 2 shelves in, and when I follow these guidelines the kiln gods do favor me with matching witness cones. This has all turned out not to be a big problem for me anyway, because I havenâ€™t had as much time as Iâ€™d hoped I would to be making stuff. Also running the kiln seems to cost me only about $10 a month for 3-4 firings. I expected the cost to be much higher. I'm making less at one time, but also getting more instant gratification, (instant being a relative term when applied to a slowly cooling kiln). Should I be less concerned about matching cones? I assume it's a matter of degree. It can be more than 1 cone. Also, I have been "lidding" the load with the 2 unused half shelves because I feel I should have them in there to increase the thermal mass, which is already 1/3 less than what the kiln could hold. Any thoughts on that? Thank you in advance for your advice and experience Irene in NJ