Kazait

Question

Hacham Abadi, Here's your definition of Kazait posted in the Pesah Halacha section of this web site: "The measurement for a "Kazait," which is the size of the Matzah and Maror required to eat by the different periods during the Seder, is about 1/5th of a square machine Matzah. For round hand made ones, use your judgment, since each one is a little different. This is with the exception of the first Matzah eating each Seder night, which is a Torah requirement, and therefore one should eat ½ of a square Matzah." I always learned that a kazait equals 29 to 30 grams? If so, 1 kazait equals 1 square machine massa or ½ an average round hand-made massa. 1/5th of a square machine massa equals 6.4 grams and ½ of a square machine massa equals 16 grams. Big difference from what I learned! Every Seder of Pesah we eat 4 kazaitot of massa (mossi, massa, korech and afikoman). Am I eating too much massa (2 whole hand-made round massot!) to be yosse? Thanks.