So now i put in some good hitting time on my second frame i find it is playing differently from my first, feels like it is less polarized, even though I modified it to exact weight and balance spec 12.3oz 7 point HL. Magic is gone, effortless spin and pace is gone and now it's just another decent stick
Switch back to first racket and all is great in the world again.
Without silicone the second racket also has a bit if hollow feel down low.
Maybe fxp/lux strings weight more then 17g (1.20mm) Tour Byte?
More testing to come...