The two are really entirely different philosophies on set back.

KOP is based solely on lower leg dimensions, with the objective of producing specific angles at your ankle, knee & to a lesser degree hip. If you have short femurs your seat will be further foreword. Nothing going on above the waist matters.

Steve's hands off method is looking more at your functional torso length. With the objective of balance and reducing the use of muscular effort to maintain position. For example if you have a short upper body, or if you have a humped rather than flat back your seat will be further foreword. Not much going on below the waist matters.

Personally I've had better luck with the latter, less tension/weight on my hands and improved breathing.