I didn't change anything about my arrows.
These are the two things I changed as a result of attending Rod's class:
Increase in focus on maintaining back tension throughout the shot. As a result, my string hand moves backwards after the shot, as opposed to staying in place as Rick teaches. Some people have noticed an increase in arrow speed as a result of doing this, which could lead to them needing a stiffer arrow, but in my case, my old arrow set up seems to work fine.
Raising my drawing elbow, so it's a little bit higher than the arrow at full draw. This helps with back tension. I don't know that Rick has an opinion on this one way or the other, but Rod felt I would shoot better with a little higher elbow, which seems to be the case.
Did you change your arrow setup, David?