Matt, the Vallorbe files arrived today, thanks.
While I was waiting for the distiller to get up to temperature I set down and inspected the various files.
The Vallorge and Stihl files appear to be made by the same manufacturer. They both have the same pattern, but the Vallorbe files are 4.75mm in diameter and the Stihl are 4.85mm.
The Save Edge files have the most aggressive pattern and are 4.75mm in diameter.
The Husky files have the smoothest pattern and have a diameter of 4.65mm.
I expect that the Husky files are designed for use in the 'Roller Guide' and that is why they give the best hook of all the files.
I tried making up my own chain with different angles than the factory. Good thing I used a worn out chain - it was a disaster. It didn't cut any better than the factory angles and looks down right ugly. It will now be retired as a 'stump' chain. Back to the drawing board...