Don I went through all this a few years ago with my Minolta D7i.
I used an old 50mm minolta lens reversed onto the fixed zoom lens of my camera.
Same as you I found the lens to subject distance to be 1-2mm and DOF to be virtually non-existent, with of course the almost impossible task of illumination.
On the attached image I arrange two flash guns with the light bounced of several A4 sheets of white paper strategically placed.
Now with my 180mm macro lense this as become childs play, I've not checked the lens to subject distance with this lens, but with the canon I get a working distance of approx 62mm.
Harry
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