When I first started, I wasn't sure it would turn out, but I kept going in hope that it would all blend together once it was "seasoned". If you used enough yarns in your hanks, I think it will fluff up and turn out just fine.
The 1/3 - 2/3 thing works fine on mine because I extended the bipod legs fully. I also expected to just flare the yarns outward should I lower the bipod.
Also, if you cut the skein in half the way I did, the yarns will become shorter as you peel off the outter yarn and work your way to the center.
So, I found it best to alternate sides of the barrel as I tied the yarn hanks onto the elastic. This keeps the longest yarn lengths to the muzzel where the rifle is typically higher off the ground. As you alternate sides working your way back, the yarns become shorter as you go.