I don't have any ideas why the 001122 and 001125 didn't ball up. I will ask around here!
I do know that it's best not to use any more heatwork on those two styles than necessary--if overfired, they can turn opaque.
I think your kiln is running cool if it takes 20 minutes for the other styles to ball up. Perhaps 1575°F for 10 minutes is your magic number. (By running cool, I mean that the thermocouple/controller rig is reading hotter than the actual temperature inside the kiln, so you may need to adjust all your schedules to accommodate that, adding 50-75 degrees at all holding temperatures.)
Mary Kay Nitchie
Bullseye Glass Co.
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