The inner diffuser is removable, but I feel the unit is well designed as is. I measured the output of my Nikon SB-700 fired in manual with a PocketWizard AC3 and Mini TT1 triggering the flash via a Flex TT5. I used a Sekonic L-358 to measure the output of the speed light without the SMDV Diffuser 60 and then again with the Diffuser 60. From a distance of about 9 feet, I got a reading of f/9, (ISO 200, 1/125 sec.) without the soft box, and f/8, (ISO 200, 1/125 sec.) with the flash attached to the soft box. This test was with the inner diffuser attached as shipped from the factory.
Thanks for your question,
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I'm not familiar with your flash but on my speed lights, like anything, the ambient light matters a lot. If it's during golden hour, 1/32 or 1/16 is a good starting point. During stronger sun, you will need 1/2 or 1/1 and pretty close to the subject.