Musar II would also have to include books related to world view issues like the Emunot Vedeot of Saadia Geon. Because you can't separate character traits from world view. They are highly interconnected.
[There is a tendency that you find in the book of Job, "Is not your fear your stupidity?"Fear of God is often coupled with not very smart doctrines. Musar as it exist today is a good example. Most Musar books that are published in the Orthodox Jewish would today are incredibly stupid.
Musar has certainly decayed from the time of Israel Salanter. This has to be changed.]