What's the difference between 550 FP down and 700+ FP down? Besides the minor difference in weight. I know that it takes more 550 to keep you warm. Does it mean there will be more feathers? Comparing quilts that i want to make, same size, same 3 season quilt, just different FP. There is only a difference of 2 OZ, i think i can live with that. Seems a minor amount of extra weight. I see posts about people harvesting down from sleeping bags, pillows, etc and i wondered if the difference in FP really mattered to such a HUGE degree some would have you believe.