i usually leave them for more than 6 hours sometimes overnight. I quit speed curing in kiln because of cracks and flakes,
if im not doing wax disc i sometimes leave them out in sun for a few hours and this is after i uv cured them in box.
Something u said about the heat not reaching center made me re think my kiln temp hold times. Ure right 2 hours is not enough for the size...maybge for a 2 by 2.5 inch but this disc is diff...il try raising temps to 1400 for 3 hours. Maybe blow ash out and see from there.
i bought that cheap salon uv light thats recomended in wiki,, i have 2 of those held together by a giant rubber band.
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Question ----have u ever tried jumping from 300degrees ---full ramp to 1400 degrees..and see if wax burns out before it can expand and such.