the stock knuckles are cast and break pretty easy, you can get the cnc ones that are real tuff but they'll cost you, I don't know what is more the cnc knuckles or the pbs conversion. depending on your track if you race pbs and c=hub handle differently and you may prefer one over the other. once you upgrade the knuckles there wouldn't be much difference strength wise between the two set ups.

i'ld do a bit more research into things before you swap it out to pbs, if it cost a lot more to get the cnc knuckles then the pbs kit maybe get the the pbs. If you are breaking the cnc knuckles i'ld say try pbs.

are you having dramas? if so whats happening.