Air Conditioning - Adding Insulation around attic AC ducts: Good Idea or Not?

I have rigid fiberglass heat pump ducts and insulated flexiduct running through an uninsulated attic (Charlotte, North Carolina)....I want to add more unfaced insulation...if I cover up the ducts in the process (not the air handler)....will that help reduce heat loss/gain for the air in the ducting...or will I be creating other potential problems? In the winter, with lots of cold air in the attic...it seems like it might help keep the air warm as it moves through the ducting, but in the summer I'm not sure if I need to worry about moisture problems....thx

There's a point where an incremental expense in insulation will not render an equally incremental benefit (say, in heat loss/heat gain reduction). Rigid ducboards are naturally insulating components.

For a heat pump, if the air coming off your registers is 55-to-58F [summer] and 90-to-100F [winter], it won't get much better by adding more insulation to a duct already made of an insulating material.

And to answer your other question, you do not need to worry with having a cold attic [winter] or a moist one [summer] if you decide to go ahead and wrap those trunks and branches.

Thanks Pflor....appreciate your feedback and the point on incremental gains vs. expense. The thing I was most worried about was the potential for moisture to wind up trapped between the added batting and the rigid and flexiduct exterior surfaces underneath....sounds like it's not really a problem...I'm assuming that any moisture penetrating the outer layer will work it's way out through the outer insulation given that there is no vapor barrier keeping it from moving back into the surrounding attic air. ... Thanks!

Water vapor fows always from an area at a higher pressure to another at a lower one [pressure goes from high to low always]. Vapor pressure is directly proportional to the temperature of the gas (in this case air).
Sweating occurs when the temperature of the traveling moist air drops to its dewpoint (or below) as it moves through successive layers of a permeable material, in this case the ductboard.
[sorry about being too technical]
Heat moving through the additional batt insulation you're planninng on adding will not experience a significant drop in temperature, and most certainly nowehere near its dewpoint

If [during the summer] the outer surface of your ductboard is not sweating, before the additional insulation is added, it won't either afterwards. And the shiny (reflectorized) outer surface of the ductboard is a vapor barrier in and by itself. Heat may move, but moisture is stopped dead on its tracks right then and there.