Are you guys speaking about Pillow ball cups? If so I think the platic ones would be better. My reasoning is that with metal pillow balls rotating in metal cups their is bound to be excess friction and bind. Think of a hip joint, ball and socket replacement in humans the socket is lined in " plastic".
I have not damaged a integy knuckle yet. I have tore up some other stuff but not an integy knuckle. There are other choices out there. I don't recommend the rpm knuckles.
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Are you useing the stock servo for steering? I had the same problem untill i got a stronger servo. the traxxas servo really isn't strong enough to handle an Emaxx at full speed. may want to check into a new servo.
Work because i gotta, play because i wanna
People here hate Nitro, I love it. I start it, run it about 50 ft from me and it dies, I go after it. Perfect exercise