Hi and Welcome, jille,
Your blog is very nice, clean and bright! As for the thin pieces warping, I find that I have to leave my ornaments a tiny bit thicker than I'd really like or they
will warp!
And, as for your Nichrome wire sagging and touching the shelf, do you have the little kiln sitter tripod things over there? You could place them under your ornament during firing and not have to use the wire and hang them?
Again, Welcome and thanks for posting!
anita