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Update: Cut and fused another blank about 1/2" or more small than lip of bowl. Carefully checked the shelf to be level as well as the mold on top of it (on kiln furniture). I slowed the ramp and hold times on this last try , going at 250 dph. Still a lop-sided slump. Not a lot, but noticeable t...

Thank you for the suggestion on a slightly smaller blank....it makes good sense to me because I do think something caused these to hang up on one side...will try again this weekend with a slightly smaller piece and let you know how it goes...

I did not use a level on the top of the glass disc. It would have not helped as I knew the glass contoured in the middle where the additional piece of design glass had been placed. The center design approximately was a rectangular shape and I have used this design successfully in many other sized pl...

I did check the shelf and mold with a bubble level and all is where it should be.

I am using a 12 1/2" Slumpy's mold, about 2" deep. It is set up on thin kiln posts to circulate heat better. I have tried two different pieces that are BE COE90, fully fused 2 3mm layers of Crystal Clear with a center design in streaky glass and frit. They are about 12 1/2" diameter. ...