farrocks:
I don’t know what the Chofetz Chaim did in his home but he does discuss in the Mishnah Berurah about eating knaidlach on erev pesach afternoon. He does not mention any minhag of avoiding wet matzah over there. Also, keep in mind that the minhag of avoiding wet matzah was enacted concerning hand matzah. Those who decided to be stringent never saw the machine kneaded wheat matzos most people use for the larger portion of the holiday.