I don't use this tank, but generally speaking if you use a higher resistance coil you should not try to match the watts of the lower resistance coil (as you have to effectively increase the volts).
Personally, the notion of 'a bad coil' is something I have worried little about over the last two years ago. I use 2-5 different types of factory coil and have only had 1 bad coil in all that time. The enthusiast vaping community makes out this is a major issue; many of them say this to increase the kudos rating of making your own coils. I make coils too. Of course, a factory coil on a consumer-grade tank will not vape as well as a handmade coil and wick on a RTA.
For me, I would never push a 1.8ohm coil to 14 or 15 watts, regardless of what the manufacturers say... they really over-exaggerate and work on best-case scenario really.
So, as harsh as this sounds, don't vape a coil rated up to 16w (under perfect conditions) at 14 watts.
My favorite plug and play coil is rated by the maker from 10-30 watts. If I vape it at more than 16 or 17 watts, it's dead in 24 hours. If I tried to vape it at 30w, it would be instant burnt-cotton-phone-the-ambulance time.
The makers will say anything. So will the reviewers too, who like to post their review on youtube less then one day after trying out their new toys. One month or so (4 or 5 coils) is fair time to assess a product and what works (power, juice ratio)....
Good luck. It has a super reputation b.t.w.
