You have to set the light source more to the side to make the side edge shine. Or to the top for the top edge. Deselect Global Light to be able to use different angles in other instances of the Layer Style. This is similar to how a still life photographer would set his lights.
You can combine a couple of Layer Styles by duplicating your shape layer and blend them with the 'Lighten' mode.
Here i used two. One with your setting and one more on the side.
If you want to expand it, try and play with the Contours. It usually helps. Open the graph, and adjust it the way you see fit.