Aligning the blades to the vanes is an old wives tale (or more correctly an old bowhunters tale). It makes no difference in the flight characteristics.

It is however imperative that the BH spins perfectly true (no wobble).

One thing that can be done to help bring in flyers is to twist the nock 120 degrees to the next fletch and shoot the arrow again. Often times spine variations in the arrow will cause flyers. By twisting the nock you move the variation and will often pull that arrow into the group. If it does not work, try it again and go another 120 degrees.

After twisting the nock, ensuring that the BH is straight, even replacing the nock with a new one and the arrow still does not group, you have found yourself one of the best tomato stakes made. Cull it from your quiver and use it for practice with fieldpoints, make a pen out of it, or as I eluded to, use it as a tomato stake.