As I suspected we're mostly on the same page then with the main difference being (if I'm correct) that I interpreted radical feminists as the subset of feminist

As I suspected we're mostly on the same page then with the main difference being (if I'm correct) that I interpreted radical feminists as the subset of feminists who hold radical beliefs rather than referring to a specific 'radical feminist' belief system and its views on trans* issues (whose existence I was not aware of until now.)