Hullin 44: Resolved by a Bat Kol/Heavenly Voice (Or Not)

An investigation into an acceptance of the stringencies of Rav and the stringencies of Shmuel when it comes to the details of shechitah, including the location of where one begins the process of slaughtering. But taking the stringencies of both sages, instead of following either of them for the full gamut of their respective views, seems incongruous in its inconsistency. Plus, the bat kol (heavenly voice) that establishes halakhah as per Beit Hillel, though it seems a contradiction here -- and also as against the statement that we do not determine practice from a bat kol! Also, what is the "majority" of the trachea? Is it the thickness of the trachea wall or is it the majority of the hollowness of the tube itself? Plus, the case of Yehezkel (Ezekiel), who never personally ate from the meat of an animal that had been called into question, even though it was subsequently declared fine. Also, the decision to offer the prime cut.