In my kiln, 1350 is too hot
In my kiln, 1350 is too hot for slumping. I usually slump at about 1225. For a small piece, I bring the temp up 500/hr to 1100, hold 15 – 30 minutes, ramp 250/hr to 1225 and hold until it looks “done”. Then on with annealing and cool down.
Jester’s Baubles Fused Glass Designs