Yabia: Where go you get your information to claim it was only in the 1600s that the Ashkenazic population became larger than the Sefardic? Even today, after the Ashkenazim just suffered a Holocaust, worldwide Jewry is numerically much more Ashkenazim.
In any event, go to any fully stocked Beis Medrash, even a Sefardic one, and simply count the number of mechaber seforim published after the generation that lived in Spain/Portugal totaling each from the Ashkenazim and from the Sephardim.