[HawgRyder]

Considering the width of the surface of the rocker...it would only take a fraction of a degree when grinding to create a non-parallel condition of cam to rocker face.
Obviously the more "wear or coverage" on the rocker face indicates the more true grinding of said raocker.
I would think that even with a very acurate jig...you could still get a slight offset of degree.
If the bushing is replaced first...then honed to size...then the rocker is jigged and ground...you would have the best chance of maximum contact between the surfaces.
This all supposes that the cam lobes are 100% accurate.
I believe we all go for the best possible contact area...but given the geometry and accuracy of grinding...it will never be 100% to our visual liking.
The next step of course is to redesign the whole system...so that everything is perfect.
Not feasable for cost reasons...but it would make everyone happy...LOL
Bob