If I may just throw my two cents in, to give a communist's view of the whole spiel....
The Sino-Soviet split was over the issue of revisionism- Kruschev reintroducing limited private property, his policy of 'peaceful coexistence' with the west, and the rampant careerism and cronyism practiced by the leaders of the post-Stalin USSR.
Though the post-Stalin USSR still professed to be Marxist-Leninist, they were often referred to as 'Eurocommunist' which reflects their less radical nature- I think this would be the perfect substitute for 'Leninist'.
One problem I had with the original ideology matrix was the difference between Leninism and Stalinism, when in fact the two are synonymous- Stalin's policies are Lenin's theory put into practice. Absolute hardline communism, in my opinion (absolute authoritarian, absolute left), should just be plain 'Marxism-Leninism'.
'Castroite' or 'Castroism' isn't really a word... As a substitute for 'Left-Wing Radical' I'd use "Titoite", as Titoism (a la Josip Broz Tito) - reflecting all the pseudo-socialistic nations that were left-leaning but not officially aligned with the Eurocommunist or the Anti-Revisionist blocs- (for example, Nasser's Egypt, Tito's Yugoslavia, Saddam Hussein's Iraq)