Still working out my 510 pin leak.... When I rebuilt it last night, I took everything apart prior to draining and running water through everything.... I figured I was getting liquid running down the center post from contact with the wicks so when I wicked the new coils, I made sure nothing was making contact with the center post and the wicks only touch the deck where they go into the channels.
Fill it up after putting everything back together, clean up the air channel leak because I top filled, take a few hits, take it off the mod to adjust the AFC and the 510 pin is leaky again.
During my clean and rebuild last night, I made sure the little well around the center post was clean and dry.
With a clean tank and build, the leak is the same color as the liquid in the tank, but as everything ages, the leak is darker.
Which leads me to believe I'm cooking/burning some fraction of liquid instead of vaporizing it fully and/or its building up inside the chamber, condensing, and then somehow collecting in that tiny well around the center post and leaking down through the insulator around the 510 pin.