It might be that turning on Profiles in your style's edge settings would take care of the issue.
With profiles turned off, you can wind up with this sort of thing.
[image: 6207200155_e6846d44e1_z.jpg]
But with Profiles turned on (and set to 1) curved surfaces will look like this.
[image: 6207200107_2bdf29730d_z.jpg]
Using hidden Line for the face style makes this appear a bit more dramatic than it will in other face styles but the same thing happens with those other face styles.