i *always* used to whip servings and you can find my pictorial on that in the how-to resources forum. but as of at least a few years ago, that method is just passé compared to the overhand knot nocking point.
i still use dacron bowstring fiber for nock points. i cut off a piece about 12" long and use a piece of paper towel to remove much of the wax.
the way to tie overhand knots for a nocking point, and have a very even wrap, is to simply reverse each overhand tie and layer it. the last overhand gets tripled, cut the two 1/8" tags, then flame, melt and press into the existing wraps. it is even and clean looking and quite rounded.