I find it quite interesting that you found other sticks with a similar or even stiffer RA had a power plateau compared to the PS97 v14 -- Im thinking of stuff like the PA98, Strike 98, ISO 315, WO, etc. I presume you weighted them all up to a confirmed-identical strung spec, measured with a SW machine and identical string setup (Alu @ 45)? Presuming yes, then, for lack of a more coherent explanation, it simply may just be that, as @A_Instead said, you're "just a ProStaff guy", paper physics aside. Obviously a testimonial to never really knowing until you get the racquet on the court. Thank you for detailing your journey for our benefit!