Simply said, the further forward you run the CG, and the more positive incidence you run, the worse the "dive" tendancy is going to be when inverted.
The statement about CG made here is only correct for extreme variances from the recommended CG. The same can be said for the incidence... Half degree positive is an excellent starting point for incidence on modern pattern aircraft. I've seen both in practice and know that what flyincajun recommends works. Of course, it might be easier to help if we understood what kind of airframe we're working with here, as well.