Francesco, Clay is right. With EFKE PL100 you do need to compensate for reciprocity failure at times over about 1/2 second.
Your contrast range should be easy to fit on the film with Pyrocat-HD; I usualy don't start thinking about compensating developers until the range is like EV 3 to 14. This is surprisingly common aroud here - my bridge photo measured EV -2 to 17. I didn't develop that in P-HD...