You're on the right track for flattening this piece enough to move on to the next step. If possible, plan to be present near the process soak to be able to adjust accordingly. I'd be more inclined to extend the hold time than to increase the temperature. It depends on the form and the viscosity of the glass, but I generally slump-to-flatten between 1180 & 1225°F. Being prepared for and embracing possible unevenness doesn't hurt.
Because the side with the pink isn't flat, I'd plan to advance the slump as soon as the piece flattened overall, but before the blue areas completely touch the kiln shelf. I'd be concerned about creating areas that could trap air between the glass & kiln shelf in the next firing. In the re-fuse you could fire on a piece of 1/16" fiber paper (& ThinFire) to give that air a better escape route.
In your next fuse firing, the areas that made contact with the mold & the shelf from flattening are more prone to devitrification & you may want to add a thin layer of clear powder as a preventive measure if they're not covered with other glass. http://www.bullseyeglass.com/methods-id ... flaws.html
Also: The first step of the Deep Slump molds is pretty gentle & the glossy side probably fares pretty well. The 2nd & 3rd steps are steeper & I've seen at least one tech issue come from firing the glossy side against these molds. It is more prone to stick, drag & create an uneven slump than the original shelf side. If you've done this successfully before, that would be great to know.
Please don't let these warnings stop you from moving forward with your project! When it's all said & done, you may not see any adverse effects.
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