That link looks like the newer water cooled model TC is pretty straight forward to change shims??
They look the same as the others in real, like i say clearances are all fine which is the strange one. If they were out then would then i could understand but since they are in tolerance i am hoping its just the norm. All the searching i have done including watching Jim's DVD donsnt really show a view that i can confidently determine.
As matt w said they are machined that way,
The valves run at an angle to the cams hence the taper ,
the dark surface hardening is polished with wear, nothing wrong in your photos,
Roamer,