Yanky55 says:
You’re way off base in terms of nusach. MOST people correctly use the nusach of Shabbos Mincha for Avos as well.
Actually, you’re way off base according to what I learned, and I learned nusach from a well repsected Rav who learned it in pre-Chorban Europe. He quite emphatically said – many times – the correct nusach for Shabbat mincha is used for Kaddish before the Amidah, and picks up again with Ata Kadosh (nusach Sefard) or L’dor va’dor (nusach Ashkanaz). It is not used for Avot.