Scott, I cant say how thrilled I am with the service and timely responses to my questions (such as yours) that I have recieved from AYCE (paul) at Thru-hiker.
It seems to me to be one of the better fabric sources. When it comes to down, go to Ed Speer- his 900 down is fantastic! I used 2 oz to overstuff a JrB sniveller (at 10 baffles, 5.7 g each) and it lofted up perfectly. The extra 2 oz of Speer's down (which came with a lab certified 927fp document) filled all of the open space in each baffle but without hampering the loft- I measured an even 3 1/2 inches (a 1 inch gain in loft, overall for a mere 2 ounces) over the past few "field" uses, finding at least a 12-15 degree temp gain. This quilt will easily push 25 degrees for me. Im a cold sleeper. Anyway, Speer isnt paying me to advertise any more than I already have :) so just buy it.
Momentum 90- ripstop from Thru-Hiker. I like it.
another idea, use your gram scale with a small trash can (bathroom size)on it and place Speer's 3oz. down bag inside. Weigh the whole mess and use a vaccuum hose w/ a piece of taped pantyhose at the end, where the hose attaches to the vaccuum. when you suck enough down to fill a chamber, the scale will give your measurement in - (negative) weight. Remove the hose and tap, or blow the down into the chamber. Tare the scale and repeat. This method lost maybe 20 down clusters that were easily sucked from the air without confining yourself to a tent, a bathroom or any other silly method. Pick a big a workspace as you want. I used a small 1 gallon shop vac with a 2" by 20" hose extension.
*note: dont use a powerful shop vac for this method!
dont taste the down! It doesnt taste like chicken!