I have to disagree with your opinion of Branch O'Keefe. They wanted to know my setup and what I wanted from my bike. They do completely a different job for touring than they do for bar hoppers or cruisers and they will advise you on the best setup for achieving the ride you want. Cams, Pipes, throttle bodies or Carbs, even turbos or superchargers. They don't just hack open the chambers to give max volume like you state. Is there bad blood between you and Branch?
Take a set of their heads and put them on a flow bench.. Not impressed. I have a bud that used a set in a 06 FXD. 95ci, DM595 cam. I had a 02 FLHRC that 95 ci, crane h290, modified 06 heads and TDs. Smoked him more than once. He ended up going to WFOLarry.