I need to make a photo of an iPhone case. The picture I've got with my rig used for other (non reflective) cases gave me the following result:

Which I don't like as it don't shows the reflective surface.
I tried to reflect articulated softbox in the front surface. But I get the following:

Don't look at the bad angle and uneven background - it's preproduction shot, my main concerns are:
the roughness of the light glare
accuracy needed to set the position of the subject
As you can see the glare is unpleasant. At least I'm far from being satisfied with both these images.
I'd be happy to get something like this:

But in my case the surface is not so flat on a macro (it is a rubber or something like that so it has some curvature) and micro (it has some grains) levels.
Can you suggest anything to make the shots better? My only thought is to draw the glare in Photoshop, but I have tons of those cases to take a shot so I'd better make a rig and save my time with postproduction.
UPD: I decided to make the glare in Photoshop. Of course it is a time consuming job, but I think that the natural glare will be also tricky to obtain and the quality will be probably not as expected. My current result is the following:
