The savage flux shafts and cups are very strong. You are running the SHD parts right?
I ran them without any problems in my 6s 1520 17lbs truck... never had any problems unless i tumbled and bend the shafts, but havent had any probs at all with outputs... yes there is wear, but not that bad?
I sold my flux because of the weak outputs that rip apart every 1/2 pack and even the pins on the driveshafts snaped of just as often! But i liked thenrest of the truck so i migjt buy another one if there are stroger parts out for it now?
It must be user error. I have never heard anyone say this before. However I did bust a pin on a center dogbone within the first few packs on mine but i replaced it and havent had a problem since and that was over a year ago. I think it was not hardened properly or something.