One note bjhnor,
You will most likely need 2 different formulas depending on your paper stock. Coated and uncoated will require significantly different formulas /recipes. You may have found this out already by the time of this writing.
This is inherent to pANTONE with many of their color offerings. This has been very well chronicled. EZ as Pantone 123...... September 11th.
D