How you liking your Legend?
With that regulated mod you can run whatever wattage you want regardless what the coil says. I can say that because if you run it too high it will be hot, taste bad, ruin the coil.
But, smok over rates the wattage range and their coils and they tend to burn out fast if ran even just below to the upper stated wattage.
Maybe you want an RTA with premade coils that last longer and so you can build to suit your flavor/cloud wants, without burning through expensive coils.