Another post showing duelist to modify minimum backstab damage:
Quote:
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The backstab modifier also increases your minimun backstab damage on your duelist disc. It does a min. of 416 on duelist. Still only 130 (lvl 65 standard) on normal minimum backstab though.
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source
even though he/she is talking about the backstab modifier on that weapon, you can tell that duelist should raise minimum backstab damage even without the 10% bs-skill modifier.