One thing I would suggest as well is put the coil more in front of the airhole. Only half of of the coil looks to be in front of the airhole. I think you'd enjoy the vape a bit more if it was centered there. Plus wicking would be easier as mentioned above.
As far as watts, just play with it and adjust to taste. I never paid attention to watts, just adjusted up or down to how I enjoyed it.
See, (not the same atty), but you can see with the top cap on, you can see the coils through the airhole on mine.