1) weakest, Profaci family. Least secure boss none. I have to say Bonanno and Profaci both faced hurdles at the start of their reigns, and again at the end of their reigns.
2) Not problems, but a peeve of the other bosses was that Luciano was to flashy and would prefer he stuck more into the shadows.
3) Bonanno and Genovese are tied. There were still a few in each family that could not forget about the War, and were trying to avenge or get even with whoever had killed their blood family member, most were associates.