Which shiur is correct?

Question

Shavua tov to you all. Aaron, thanks very much for the response via e-mail to the question/concern I had on that kitniyos issue. For the last two Sundays in our Ohr Yitzchok shiur, Rabbi Berg and I have been studying the Hebrew version of your father's Hilchos Pesach (the Hebrew one found on the Pesach portion of the Halacha part of this website). I printed off two copies of the Hebrew Pesach halachos from this website, one for him to keep and one for me. As we do with our weekly Ohr Yitzchok learning session, he translated for me what the Hebrew meant and I took notes and put them in a notebook as I listened. This morning we talked about the seder portions of Hilchos Pesach. The quesiton I have is: On the Pesach section of this website it says that the shiur for motzi matzoh is half of a square matzoh. But according to the Hebrew version, Rabbi Berg said that your father holds that 1/3rd of a square machine matzoh is sufficient for the mitzvah and that the half of a matzoh shiur would be for the hand made matzos. Which one is correct nowadays? For the moror, korech, and afikomen portions of the seder, it says on the website we should eat 1/5th of a machine matzoh. But the Hebrew version of your father's halachos says 1/6th of a square machine matzoh is the minimum shiur for each of the three portions of the seder. Which one is currently correct? Once again, thanks as always for all your help and shavua tov to everyone