SS will work as I said, depending on the MOD and tank/deck (RTA or RDA), but not on everything every time... the smaller the coil, the harder it is to get it working right.... if you're doing a fairly large build, it should help it work correctly. But on my various RTAs and RDAs, every time I tried single coils I had issues, and so did a LOT of people (plenty of threads and discussions easily found online about people having the exact same issue, including other vapers in my area that I've talked to).
And it's not just wattage... I tested at very low wattage, with nothing worth while until I'd increase it bit by bit, and once I'd get actual vape and warmth, it would start giving me burnt taste almost instantly. I tried various gauge, on various settings, in different tanks, always the same results.
Add to that, that my several mods had trouble staying in SS mode with the small single coils (Eleaf, Joytech, Smok, Innokin), but once switched to dual coils (in the various RDA/RTAs I have), every problem went away, logic dictates that it's simply a question that enough wire is needed for things to work properly with TC, that the power being split into two channels balances the ramping better.
If you managed to have tanks with single builds that worked out for you, that's quite great, but it's far from everyone's experience.