I don't know the answer to your question, but I agree with SDF you have too many causes (potential). My guess is you are mixing hierarchy of the causal structure. My advice is to stay within one hierarchy of cause effect continuum and don't mix hierarchy in one Pareto. This is nothing wrong with multiple Pareto charts each for a different hierarchy. I will try to illustrate with the following continuum:
If you are looking for causes of the loss of the battle, horse, nail and shoe would not be on that Pareto. Rider and others at that hierarchy would be on that Pareto.
Also remember, you are looking for big jumps in the Pareto plot to be able to claim assignability to the cause (vs. simply random variation)
"All models are wrong, some are useful" G.E.P. Box