I wondered A LOT about two kinds of plain old white flour ..... but I'm the sort that has to follow instructions - do things right. I went to the store and bought cake flour ~sigh~ . Great cookies!!! Really great cookies. On my next shopping trip I bought two more boxes of cake flour. Now I'm going to try to figure out how to use that fancy stuff in other recipes.
Please don't tell anyone but I did cheat and use regular salt instead of Kosher.