It is likely this was already considered by Clay during the R&D phase, which would (having a sense of Clay’s attention to detail) likely have been field tested extensively. A balance was likely struck between weight, feel, effectiveness, durability, strength, etc….
I believe that the system is very well balanced and allows for you to increase pressure, then back off when needed. I am able to make extremely light passes when needed without fatique, etc…. If you are getting fatigued, then you may want to consider whether you are using the right grit for your objective or expecting something the system wasn’t meant to accomplish. Just not sure….
I sense from all the reading I have done and the experience with the system I have had that with good broken in stones, progression starting with the right grit should yield excellent results without fatigue, which I haven’t heard much about.
Just my 2 cents…take it or leave it.