Your Dhukk badly needs more accuracy. I'd prioritize FB over Paragon for books - you shouldn't need Paragon until the high stages of spider anyway, while you need FB to start doing big damage on the CB as soon as possible.
You could take Bystophus to 60 for more damage indeed. Fellhound as fast farmer doesn't seem like a priority, unless for you personally speeding up farming is high priority, that depends on how much time you have for the game of course. Oathbound, Luria and Doompriest are definitely useful, I'm not convinced about Torture Helmet or Fleshmonger.