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To minimize DOF you need to shoot at a wide aperture, you say you are using fill flash which will probably cause glare. Have you tried no flash and a long exposure as you are mounting on a tripod.
If you are close to the subject then try also to move the camera back a bit to see if this improves the DOF.
If you go for a long exposure it will be worth using mirror lock up and if you have one a remote or cable release trigger, if you don't have remote triggers then the self timer is another option,
If you find it is not light enough you could try switcing to manual and giving a longer exposure or shine a torch either side to see if that gives the desired effect or alternatively try using a hot shoe cord and hold the flash to one side (this won't work with a long exposure BTW).
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