I never put out a formula until i've tested them in the shop, the studio, and the stage.  I had the rare opportunity to have folks like la Familia Valera Miranda, Septeto Nacional de Cuba, and Changüi Guantanamo test these renditions.  Leave a note if you have any special requests.  I make these with the expectation you are using a tailpiece.  If, indeed, you are using a fixed bridge, please include that in the Notes/Additional Info box on the order form.