Maybe this will work for you. Give it a shot and tell me what you think.
You almost certainly are going to know whether you want your story to end in a success or failure. So, once you assign that, then just assign the crucial element and voila!
Select two or three more traits and you should have your story form all completed.
The cool thing about this is that I spent a couple of hours writing up a story form. Then, I did the above technique and chose a Crucial Element which I thought was more appropriate. In a few minutes, I had a new story form generated which was almost the same as my original one, but better.