twisted: rekikim were less than a tefach, not crackers, and no indication of hard.
Also where do you get this “fact” that Sefardim had cracker baked early? In the past they baked fresh on Pesach and today they keep them in the freezer.
The Rema writes that the minhag was to knead a shiur challa and make 3 matzos for the seder from it. Shiur challa=1.5 kilo /3 + .5 kilo= appx 1 lbs