Well, I'm allergic to PG, so that's why I use my closest and favorite vape store, and they will give me all the nicotine I wanted in pure VG, they'd mix it at 18 m.g. for me and for all I know, higher. They don't recommend going higher than 12 on VG but they will do that. Freedom smoke USA... They're pretty cavalier about nicotine, and when the guy was examining my cleto he was able to tell me wattage ranges, my first comment was "Do I have to vape it that high, I think I'd just die...." To be fair, at that point the guy also said i might want to dilute my juice some, but I declined. I should have just STARTED with 6 m.g., that was pretty strong in my opinion, and I was surprised given the way I smoked, that it could get so low until the concept of sub-ohming was explained to me, then I switched to a nautilus 2 and raised my nic and became happy with my vape.
That said, I hope you get things figured out. It could be your coil, setup, or juice. IDK. But for heaven's sakes, don't vape your vape at 120 watts or something, that plus *whatever* nic you use, and everyone's tendency to chain vape when they are quitting.... It will be too much, I am thinking. I got quitters throat and did not need vst quantities of ANY vape, and finding liquids I could tolerate was difficult.
Take care, and good luck!
Anna