Configuration paramters for optimal ordering


I'm using Metis to reduce the fill-in on sparse LU factorization* of unsymmetric matrices**. Although the results are good compared to similar approaches, I feel like I'm missing something. I can't figure out what are the best setup for my problem in terms. Is there any reference/publication/book I could read in order to fine tune Metis configuration for my problem?

* I'm using SuperLU to factorize A afterwards. I'm aware that static pivoting will not get the best out of Metis orderings.
** For unsymmetric matrices, I use the adjacency graph of A'*A or A'+A

Thank you in advance,