Looks pretty good, but if you don't mind a critique... Just to make it even better..
The one side being dark is showing an issue. It looks to me like that side was touching the chamber wall and absorbing the condensation from the chimney, the other side wasnt and you see its clear..... Or, that side is a little thicker, which can be trimmed or slivers cut off the sides to make it the same size as the other.
If you resolved the issue that side of the wick would clear up and look like the other side in less than a day. Maybe an hour if vaping it hard. It will clear just like the wick clears when you wash it with water. A shot of base can also clear it if your juice is real dark to start with.
Yup, you are spot on. That side is the negative lead of the coil under the wick which tends to keep it pushed towards the chimney (friggin offset 4 post type deck lol). Next build I will try mounting the coils the other way around with the negative side above.