d,
First, your pool store is up to here with it. If it's dissolved, you can't see it. Those are solids, in solid form, you're seeing.
How much are you running your filter pump every day? Your chemistry looks great and you're using the finest filter media available so the only other thing I think might help is to filter more.
I have the same issue. There is absolutely nothing visible in my water in daylight; absolutely crystal clear (I can tell weather a dime is heads or tails up in six+ feet of water). At night though, near the light, it looks like a tiny parade is going through. I am running zeobrite in a sand filter that I supplement witha bit of DE (saw some slight improvement when I started with the DE supplement). The only really significant improvement I've seen, however, came from running the filter pump 12 hours a day. I'm guessing it would be even better with more pump time but at what cost in power consumption.
So, I'm going to learn to live with the speck parade in lieu of spending the extra coin in pump time to get rid of it (though it may take some therapy or large quantities of adult beverages).
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