I agree with your summation 
The 25-35 range for dust seems right to me, I was killing a lot of mobs of that sort of level in Lavastorm, SolA and SolB last night, and I did indeed get dust from spiders and basilisks near the DoN camp in lavastorm, and miners, clockworks and goblins of the right range in SolA, but I got nothing at all from a couple of hundred kills of Kobolds in Sol B -- even though they should have been in the right range.
So, perhaps, the "global" drop table isn't quite as global as all that?

The 25-35 range for dust seems right to me, I was killing a lot of mobs of that sort of level in Lavastorm, SolA and SolB last night, and I did indeed get dust from spiders and basilisks near the DoN camp in lavastorm, and miners, clockworks and goblins of the right range in SolA, but I got nothing at all from a couple of hundred kills of Kobolds in Sol B -- even though they should have been in the right range.
So, perhaps, the "global" drop table isn't quite as global as all that?
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