All good points MDay however I am stressing that fact that I have a sensitive elbow, I have used other racquets and strung with (Klip) gut and syn-gut (Sweet) or multi (PPA), however atm I have found a congenial combination of racquet and string which should add up to arm pain - and yet however don't.
I have a Spin racquet with a wide open stringbed giving more forgiveness, my poly is a co-poly which adds comfort back in.
To say, oh stiff racquet + poly is... - is really retro, based on the knowledge of a first gen PD plus Big Banger Orig that could hurt your arm - that's what ten years ago now? Come on we've moved on. I would have not believed I could have been ok with a light stiff frame and co-poly but am hitting the ball better than ever...
See, I did use a PD swirly, with Lux in it, I did feel that hollow stiffness that felt like someone hit yr funny bone with an icepick. That has nothing to do with what's available now.
Ps. I do agree that a good racq-string combo is working for me. I just don't buy the view that the APD is a poor racq or that the OP cannot tune the Cyclone to a lower tension and get good results...
JackB1 - I do agree that arm health is paramount, but players perhaps can find a combo of recent racquet/string which are stiff+poly but a bit more playable now...