The New Platinum Print by Richard Sullivan and Carl Weese offers a very complete review of films and developers for Pt printing along with guidance as to exposure and printing techniques for each film used. The final arbiter is, of course, the way that the final print looks. Consequently, the parameters suggested-while based upon experience and careful attention-are simply a starting point. The authors advise modifying your technique with reference to film and developer based upon your prints, and the subject being photographed. I believe that you would benefit greatly from reading the appropriate sections in this book. A film-developer combination that has not been mentioned yet ( I believe ) is Berger 200 developed in Rollo Pyro. If I recall correctly, using the Jobo expert tank at 75 degrees, one simply exposes the film for the shadows ( zone iv ), and develop for 8 1/2 minutes using the dilutions suggested by Formulary in their kit. Remember, of course, that the dilutions of Rollo Pyro can ( and might well ) be varied based upon your own results.
I have not yet attempted Pt printing, and so the recommendations are not based upon any personal observations. However, Berger film developed and exposed as above produces negatives that print quite nicely on variable contrast paper and my diffusion enlarger.
If you have difficulty finding the book you might call Mr. Weese and see if he has any books remaining for purchase.
Best of luck, and please let us know how things are going.
Ed