You might just find that prefer a "cooler" vape. My first cartotanks came with 1.7 ohm dual coils. The vaping experience was harsh and hot. Then I read that standard resistance cartos would provide a smoother and cooler vape. Switched resestances and they were so much better. Yet sometimes I still got that burnt taste even with the standard resistance cartos.
Read that many people prefered single coil cartos over dual coil. I tried some standard resistance single coils, again the same smoother, cooler vape but I no longer got the occassional burnt taste. In addition, the single coils were easier on my battery life.
I have a theory about dual coils. Most people punch their own cartos near the battery/connector end, or the laser-drilled cartos have their hole(s) at the same place. This is because as the tank's liquid is consumed, the carto will continue to be fed as long as the holes are below the juice level.
With single coil cartos, the heating coil is right down there near the feeder holes, so it will always have a nice supply of liquid. However, dual coils have an additional coil located above the bottom one, probably about mid-way up the length of the carto. Now, I've looked at my cartos from the drip tip side after they have been in use for a while. The polyfill appears dry, no matter how well the carto is wicking. I'm thinking that the top heating coil often doesn't get enough juice do to its higher location in the carto. The upper coil's sock and even the pollyfill surrounding it probably gets burnt, with no juice around it to produce vapor. Once this material is burnt, that is why the carto is considered ruined...there's no way to get rid of the burnt taste.
Below are some images of a dual coil cartomizer that has been dissected:
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Click on the above images to enlarge.