What didn't you like about Ebony and Rosewood?
Ebony has a very tight grain structure, doesn't it?
Rosewood is very open grained, but Pau Ferro is super tight.
Pau Ferro is also much harder than Rosewood, yet a bit softer than Ebony.
Tone-wise, I doubt if it would make much difference really, but Pau Ferro is brighter than Rosewood but warmer than Ebony.