I find that wicking the Kanger RBA is one of the easiest to get right. Just pull a snug lenght of cotton through the coil, fold the cotton up into "rabbit ears", install the barrel with the cotton sticking straight up and out the top. Clip the cotton even with the top of the barrel and push the ends into either side of the RBA.
Never had a leak using this method, so it may be a seal issue on your tank.
Personally, my biggest gripe with the BB is getting the glass on without bunching the red gasket. It seems near impossible for me to get the glass completely installed without kinking the stupid red rectangle.
Other than lubing the gasket with juice, is there a secret to getting the glass on without the gasket jumping out of the groove in the tank?
It's such a pain that it makes me wonder if it is just an issue with the SXK tanks or if the authentic boro tanks are just as difficult.