People who have completed Final Fantasy 13...?

Hey guys, I'm almost at the end. Now, I've read that the Wladislaus and Bandersnatch/Jabberwocky battles that give you 32,000 CP each are the best levelling opportunities in the game. My question is, should i stay here, max out all 6 roles to level 4 and get 999,999 CP for PGP before i leave to finish the final boss, or are there other ways of levelling this easy after?? You can't go back to Orphan's Cradle after you leave.