Since the CAS was farquared then you have to ask why.
Time to take a good look at the cams and check them for straightness, cracks and correct torque on retaining bolts. If the CAS is chewed up this could be due to something amiss. Have a look at the new CAS just in case there are some signs of metal shavings starting again.
The install of these cams I reckon is best done with new cam bearing retainer bolts and absolute care on torquing, old bolts aren't quite as accurate for torquing due to stretch and can break or crack (check them all). Snapped and bent cams can happen in the process, the RB cams are fairly long making them a little more prone.
While your at it checking all the individual valve clearences something funky may show up here before you get them out and help spot a problem like those above.