You don't get burnt taste at this high wattage? How about the risk of blowing out the coil? The Safe Vaping Chart indicates that these are the risks of running at this high power. But it seems like you are saying that it's still safe, or, are these just the risks you are willing to take?
This is why those "charts" are of minimal use, IMO. How did those of us who have been vaping for a few years ever get this far, lol??
The charts I have seen do not factor in the difference in how dual coil cartos/atty's work. In essence, a 1.5 ohm dual coil carto is more similar, in how it handles power, to a single coil 3.0 ohm carto. Many of us vets use dual coils at this power level (which is needed for them to really shine) without a hitch. I vape all day on 1.5 ohm DCC's at 11 - 12 watts. Some prefer closer to 15 watts. I have never busted a coil or burned my eliquid. I replace them about every 8 - 12 days just because they are less satisfing (like any carto), not because they are still not working.
They provide more warmth and fuller vapor, from my understanding, due to the increased surface area that two coils provide.
People who use Twists and similar weak switch PV's like all the egos, think that DCC's don't work well, when in reality it is the eGo/Twist, etc that is the problem, not the dual coil carto. Step up to a better PV (Vamo, Provari, Darwin, Zmax, etc) and you will see the difference in how well DCC's work.