One thing that I noticed makes your songs sound different/sound like bill wurtz songs is your use of the V7sus4 chord. I usually hear vi-iim7-V7-I when people go around the circle of 5ths but with you it's often vim7-II7-V7sus4-I which sounds pretty cool in my opinion. Is this something you notice yourself doing/do intentionally?
it might be more common after 1970, and the other way you mentioned might be more common before 1970. i'm not sure why