I suggest contacting Tanya
I suggest contacting Tanya and asking at what temperature her decals will burn out — that is the only issue here. Regarding the full-fuse temps, that all depends upon your kiln. However, there is so l little difference between all the temps you’ve mentioned above I don’t think it will make much difference (unless your kiln runs excessively hot or excessively cold).
Once you have kiln-carved, I would remove the fiber paper. If you are slumping at 650-665, you are not going hot enough to ruin the kiln-carving. However, leaving the paper in could cause the glass to fall unevenly in the slump.
Jester’s Baubles Fused Glass Designs