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Let me recap just so I can understand what you are saying...
You bought a used car and somewhere in the past (unknown mileage) the previous owner had the bearings (assume rod bearings) replaced. Now you are getting Vanos issues and you suspect the dealer that did the rod bearing issues mistimed the engine. So you went to another shop to adjust the timing.
Do I have that right? Did the dealer do another other work when they replaced the rod bearings?
IMO, replacing the vanos units is throwing good money away. I doubt it is a vanos issue at all. There is ZERO reason to any work on the top end that would affect timing or the vanos. I doubt the issue has anything to do with the vanos. I think the vanos code is a symptom, not the root cause. These vanos units are completely different than anything BMW has used before. I could easily remove the vanos on an S54 and retime them without issues. I have not gone that far on the S65 yet. Physically the 2 cam gears on the 2 cams are connected directly. Interesting the cams rotate in opposite directions. The vanos is inside the cam gear...not sure how it exactly works...but yes, you need to time the vanos...but if it was never changed then it shouldn't be out of adjustment. The 2nd shop should have been able to time the vanos per the factory instructions assuming they had the right tools.
I'd suspect the cam gear sensors...but 4 (or even one on each bank) being bad at the same time is unlikely. I'd also take a look at the throttle actuators.
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