So, just out of curiosity, is there a specific angle that is normally used when cutting the tilt into a topsy turvy? When you look at the pictures in the gallery you see every thing from just a slight tilt to ones that look like they are going to fall over at any moment. I just thougth I would throw this out there to see what you all think. I have never done one.
Totally up to you, the stability of your method, and your comfort level.
I usually carve down 2 inches from top diameter to bottom, and I do not find that to be a very severe slant, but enough for me. HTH