I too love to destroy my photographs.
Do you make a copy of your negative before destroying it? I have found my destuctive efforts to not work as well as I would've liked, and I would like to try again. It seems if I had several go arounds at it that would work well.
Also, try this. Print the photo you wish to destroy as normal. Then, using a negative that is dmax all over (ie: overexposed open sky, or light table) print in the artifacts and destructive qualities you desire. This allows you to have an "unkilled" negative to use in any other way you please.
Maybe these aren't true to the rules of killing, but who said there had to rules, right?