In 12-3 you'll see that Homer listed extensor action in almost every part of the page. As a hitter, I skip adjusted address by starting at impact fix. Extensor action is what places pressure against the #1 pressure point. The only time that I don't keep pressure against the penny is in the finish. The flying wedges are still assembled, but the pressure isn't the same.
Yoda told me that in 12-3, extensor action could have been added in the adjusted address position, which would support ALWAYS keeping pressure on the penny.(until finish)