Norm,
where on that site does it get chain specific. I am not disagreeing,
I just only see it recommending a 25 degree top plate angle.
Chainmakers vary their chain angles for each "model" number and
are very "chain specific", but for sanity's sake I compromise at a
60{30} degree angle [10 degree tilt on full chisel]. I posted the graphic to show the basics as this old Sandvik instruction chart
was the clearest to comprehend of all that I have seen. In the
credits at the back of the catalog, I see the name W. Galer.