Post # 5 photo # 2 has too much cotton. Do not block the front and bottom of the coil with cotton, it restricts airflow. Just let the cotton only protrode from the sides of the coil (put enough cotton in so it sites on bottom of juice well to soak up the e-liquid). Wick both coils the same. Watch a few videos on YouTube on how it's done.
Looking at this build closer, one coil has 4 wraps and the other has 6 or 7. Make them both the same. I would also try to get the coils closer to the center posts, and even them up between the posts the same on each side.
both coils are actually exactly the same, theres just cotton wool covering the end of one in the picture which i now know is due to me stuffing FAR too much cotton wool in there. I will try and get them closer to the posts though