I home brew my c-41, and use the Dignan most often. I dug up a bunch of sources about 6 years ago as the newsgroups that once discussed this stuff were drying up, and collated them into a single file for comparison and collation. The best source was a guy, Ron Speirs, now suspect as being departed. Maxwell Sanford (MTS here) is also a good source. He has sent me files on his notes, but alas cannot locate them digiatlly at the moment.
These are not Flexicolor formulae, and there are deviations on the ingredients from the 'official' mix. Try them and then run controls against commenrcially produced c-41 and see if you like what home brew can do for you before comitting important projects to it.