I messed around with my extension tubes this weekend and even at closed apertures of F14, I was getting those very shallow DOF when using more then 30mm of combined tubes. At 1.4, it was impossible to take a clean pic. So I managed to get nice pics only with either my 12 or 20mm tubes. At 36mm, the magnification is nice, but if your subject is easily scared, you'll miss your shot.
At maximum extension of 68mm (12+20+36mm), you're almost touching your subject.
Gotta read some stuff about macro tho; all i've done so far was just trial and error.
I'm still gonna post my pic tonight even if its not admitted. I hunted all week for that shot so might as well post it. lol.
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