I've got 2530's on my GTR with stock cams and find 0/0 to be the best setting so far . I have adjustable cam wheels on the front of the motor but they were bought by the previous owner and he had them installed at a certain workshop in Sydney .
When I became the owner of the car I first ran it up on a dyno and the results weren't very impressive at all 275rwkw @1.2bar and an outing to WSID proved even further that something was a miss . So being upset at this point and not knowing the reason for lack of power even though the motor proved to be healthy I let Ben and Eric from Bel garage loose on it and the main problem became evident both wheels had a great deal of advance . After they were pulled back to 0/0 Ben took it out for a tune of the power FC and basically now I'm making the same power as before at only 4500rpms .
I have read and heard of other people getting good results with adj cam wheels on std cam rb26's but I can only go off what I've actually seen with my own eyes . Differen't ppl and workshops have differen't opinions with cam wheels and there settings.