Great answer, Jim, and I have seen some of your beautiful work.
I think the only item that you may have omitted from your explanation is
the angle will change with the thickness of the stock. In other words, if
2 1/2 degrees works on 3/8" stock, that angle will probably have to be
adjusted if you go to 1/2" or 3/4" stock.
God Bless! Spirithorse