Well it appears that I've solved almost all of my leaking issues. Got home from work a few hours ago and decided to scrutinize what I could see without complete disassembly. Under a bright light I could see some unidentifiable white substance contamination on the interior mating surface where the coil/rba assembly seats and seals. I scraped this off easily with a toothpick, filled the tank and reassembled. No detectable leaks for 3 hours or so now.
Just for grins though I did remove the drip tip and invert the egrip and let it sit for 10 or so minutes. It leaked in this position. Not much of an issue for pocket carry but packed loosely elsewhere could be. Not a huge deal for me but still a defect imo.
As I've stated before though it's a great vape with the rba and overall I'm happy with the device.
Congrats on your success and tenacity! If the white substance was rubbery it's probably the white silcone they use to keep the battery from rattling around inside the device. Had some on my threading as well.

