Believe me out of the current, last year or so, there are few 22-23mm single coil rta's, and that's why folks like me bought two Merlins, no one knew at the time, they cheaped out with press fit production, and that problems could and have developed.
Agreed!
Since the day dual-coils tank is invented, all tank manufacturers crazily forget about single coil tanks and they disappear very very quickly.
To me, offset post for single coil build is the future. It offers big space to play with big coil if one prefers, it is also easier (than the dual-coils) to plug your coil to the post. Single coil deck also means you need half the effort in replacing coil or rewick compare to the dual-coils.
I really don't know what else is the advantage of dual-coils besides its ability to produce thick vapor. But now we have offset posts deck, a big coil in single deck can also do the same, so that basically means no point to spend your double effort in rebuilding coil and rewick.
Ever since the arrival of my Merlin, my pityful TFV8 nowadays hardly get my kiss.