I have had some experience with 10D. I picked up a few yards of the Kelley Green from Ti Goat a while back to make a quilt (although, I never made the quilt). I had a Prodigy quilt from Enlightened Equipment with a 10D inner and outer shell, and now I also have another Prodigy quilt from Enlightened Equipment with a 10D inner liner (the outer is the 15D). As well, I have a pair of down pants from GooseFeet Gear that uses 10D for the inner (Nobul 1) and outer (NoBul 2) shell as well.
All of these pieces of 10D has been awesome! No stickiness, tackiness, or powdery feeling that I have noticed. Instead, it feels almost silky smooth, but this is to me. I am really happy with it actually.
Of course, I don't have to worry too much with my quilts lofting much since they use a layer of 4 oz/sqyd Climashield Apex as the insulation, but my down pants are stuffed with 850+ down and they loft up really well. Although, I will admit, it is a tad bit easier for me to suck air through a 15D shell on my Montbell jacket than it is for me to suck air through the 10D. I have a North Face Verto windshell which is 7D Pertex Quantam and I would say that sucking air through it is about the same as the 10D.
As far as the final, finished weight, as I understand it, the listed weights for the 10D are the final, actual weights. I could be wrong, but by reading the desctiptions of 10D on the Ti Goat page, it sounds an awful lot like they are finished weights.
10D of course used to be called 8D. Now, there are 2 versions of 10D, Nobul 1 & Nobul 2. They are both the same base material, however, the coating on the cire side of Nobul 2 is more substantial, and this difference is reflected in the listed weights. Nobul 1 is listed at 0.67 oz/sqyd and Nobul 2 is 0.76 oz/sqyd. Like I said, maybe I am wrong, so maybe someone with more first hand experience will clear this up.
Either way, I am very happy with my 10D items as far as weight and hand is concerned.
To the OP, which bag/quilt is it that you have? Have you contacted the manufacturer about this? Maybe it was a bad batch of 10D?