I had bought a tfv12 and had some leaking issue at first but reseating oring after replace coilhead and hasn't leaked. I don't know what fixed it maybe new coil maybe just seating orings fixed it
welcome to ECF. have you tried the X-Baby? the one with the top-fed airflow? also, maybe the RBA core... not convinced by the longevity of TFV8 coils, even less so by the TFV12 ones I tried.
You might try reseating your coil again. If it worked till you changed the coil it might be the coil. A top airflow tank might not be a bad idea though. This one seems to have recurring issues
Yes, I have the X baby right now. What I don't like about it is that the coils realistically only go up to about 60 watts. I really wanted something stronger.
What is the RBA core?
It absolutely does. VG more than pg.The freezing point of juice is lower than water. But I guess it could thicken in the cold weather and therefor not wick as well.