This is alarming. Prince 03 blue and call it a day...
Do you think the frames are buckling due to the weight coupled with the string tension? You did mention a PS90 busting at low tensions, but was this on the stringer or after play?
I remember you played with some pretty heavy k90's and some ridiculously high tension hybrid of kevlar/alu. Have you ever had any shoulder or wrist problems? or tried playing with something lighter with a high swingweight, HH balance and loose poly, ala Ferrer?
I'm really enjoying the PS90 thus far, it's a crisper n90. But that quote from the wilson rep is a bit troubling, 'replace the ones that broke under warranty'.
Their business model, in regards to warranty replacement, is a crap-shoot for the consumer. Terrible.