Brother, I'll only tell you what I know and then someone else who might have done it before can tell you for sure.
Those look to me like left secundary and I have never made 2-fletch arrows before but I do plan on doing it soon, and when I do, I would do it just like you are right there. As far as I see you're going about it alright.
As far as right and left wing--I can tell you this for sure: The curvature of the feather contours to the body of the bird, so the feathers never curve outward, but lay down flat and smooth along the body of the bird. And notice the feathers then would either curve up or down. As they lay on the bird, obviously the quill end points toward the head of the bird. Now, notice the feather then could either curve up or down as it lays flat with the quill pointing to the head, depending on which wing you have it on. In this position it will curve upward. Does this help?
If not let me know. Or Google a pic of a turkey and look at the feather curvature.
~~Papa Matt