The first point is to not worry about the width of the bevel. The only way to make it narrower is to reduce the width of the blade or regrind the edge to make it thinner.

The width of the bevel is determined by the angle created the spine thickness/blade width measurement and second by the thickness of the edge grind ( just how hollow was it ground). Generally speaking the older Sheffield razors are a single thicker concave grind which results in a thicker edge/wider bevel then the biconcave ground German hollow grinds.
Because the bevel is wider it will take more time to hone ( your removing more steel).

Hope this helps,