TC Vaper here too. Same devices, but I have a weak spot for the 75c and Dicodes.
Problem that kill me, are the $20 tanks which are not really made for TC. I mean, the materials used for the 510, and the low strenght of the 510 pin in many DNA mods. Also, they are plated and they shouldn't.
The Dicodes has a 510 pin made of the only suitable material (beryllium copper) and constant strenght.
All these problems shows when you set aside the mod for few hours, or for the night, and when you pick it up in the morning, you get a "Temp protect" or a very weak vape because the 510 has developed a stray resistance, and you must unscrew the tank, clean the pin, and put it back.
For the other issue... The forum itself: my feeling is that FB has co-opted the majority of vape related traffic and trade. I'm not there and will never be; as matter of fact, the knowledge and breadth of ECF (and some other specialised fora) cannot be ported on a casual and self-referential social platform...