Joe, the profile is true, all of it. So why lie?.
As far as keeping a sharp chain, I don't really know how to do that other than to keep the tip out of the dirt. I had purchased a Stihl small round file for in field sharpening of the chain, but it never worked to well for me. I finally just tried to keep my bar very well oiled and clean and the tip out of the dirt. I just buy a new chain at home depot for $13 and don't mess with trying to hand sharpen it. It's not that I am opposed to sharpening it by hand, its just teetering at the "is it worth it for $13" kind of thing.
I guess I would be more willing if the results of my hand sharpening methods were better.