Mr Gutcutter wrote,
"The pattern you have would be better if you put two, or three together."
I concur 100%. I tie pretty much all my duns and emegers with CDC wings and I grab a bunch of feathers from the bag and look for three feathers that are symmetrical and have a nice full shape. Then I place one on top of the other until all three are like one and if the tips are not even I use my thumb and forefinger to slide them up, or down. Then I hold the three in my right hand with the tips towards the tail, I transfer the three feathers to the thumb & forefinger of my left hand and do three semi tight turns with the thread and then when I see the wing is situated properly I cinch it down with 5 - 7 more thread wraps. I too only use the tips of the CDC and discard the rest.