It appears that the piece was flipped and slumped with the shelf side facing up/glossy side against the mold. The glossy side, which has no trace of separator, can become tacky at slumping temperatures and is more prone to get hung up than the original shelf side would. The issues mentioned (off center & jagged edge) both stem from the glossy surface becoming sticky and getting hung up on the form. When flipping a piece for slumping, selecting a mold that requires little heatwork with a gentle curve will be more predictable and is less likely to get hung up. When you’ve combined a square w/ the 12” Classic & have had success –was it with the shelf side against the mold?
You could try a Deep Form slump at this point, but the issues are the same. I would smooth & re-bevel the edges before the 2nd slump.
You could also try flattening the piece by firing on a primed shelf (with the open side of the bowl face-up). For this shape, I’d run the same cycle as you’ve written & plan to be around to observe during the process soak to adjust as needed. I’ve been surprised by this before & have rescued a piece or two this way. It’s not a sure thing, especially as the piece has stretched a bit, but may be enough to take it to the next step, whatever that may be. The glossy side will continue to take on slight impressions of whatever it is fired on. I wouldn’t fire hotter than a slump to maintain the crisp design, the surface of which will also reflect the heat work of multiple firings.
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