Difficult to get bounce off those ceilings. Stofen produce a diffuser for the SB-600, part number OM-600. I have one and it does soften the light quite nicely. I would have been experimented pointing the flash vertical (bulb mode?) with OM-600 to give the best diffused light available from a portable source.
If I could refer to the thread 'Flash - Daunting or Fun' for lots of tips, advise and practical applications for flash photography.
I think by diffuser shield you are referring to the wide angle adapter, this will just widen the light source for a 14mm lens field of view.
Check out the photo below to see what the OM-600 does to SB-600 output.
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