Alright gang. I do believe it WAS the o-ring that was causing my infernal leaking! I switched it out for one from one of the pre-mades and followed what amounts to a combination of all of you folks' suggestions, and it is working perfectly now!
It's either luck, or that o-ring. I guess I'll know for sure when I re-wick. Which I might do tomorrow. And if/when I DO re-wick, I'll do my best to photo-document the process. But as of right now, I think swapping out that o-ring (or making sure the one that's already there is tight AND wide enough) should be a sticky at the top of this thread!
Seriously though, thank you all so much for the help and patience. Getting this thing working early this afternoon really put me in a great mood. I even worked up the nerve to talk to a pretty gal that was in the vape
shop that I frequent. (hey, I'm a shy fella, but she had a TFV4 and was buying
coils and I had a legit reason to ask her which ones she preferred because I'm trying to figure out if I just don't like ANY pre-made
coils, or what!)