I’m pretty sure now it hasn’t anything to do with my destructible:
http://i.imgur.com/ednAbiN.gif
It is both the same, on the right the destructible is just scaled very big. Now I could go and scale the whole world and player up to match the big canvas but that is obviously not a good workaround. I also tried to scale the source mesh much bigger but that didn’t changed it either.
Here are my settings:
Here the Destructibles I tried: http://www.tocogames.com/files/canvas-files.zip
The settings there are for the one with 3 depths, CanvasBig-Fine-3depth