Regarding #1
Birchas Hachama is actually said on Erev Pesach and not the first day. It can never be recited on the first day of Pesach, because the first day of Peasach can not fall out on a Wednesday, which is the only day that Birchas Hachama can be said. In addition, Birchas Hachama was said on on April 8, 1925 which fell out on…Erev Pesach(there goes that theory)! Should we cancel teshuva?