OK, I don't mean to muddle the conversation, and apologies for the long post, but I have a hunch as to why a small number of folks are having leaking issues with the Diver.
I have been running my Divers through the Twelve Labors of Herakles*. On my last few rebuilds, I took a bit of time to press down on the ceramic when I was inserting it into the Diver base. Frankly, the ceramics never really went in as far as I thought they should, but I didn't give it too much thought, because I am relatively new to vaping and very new to the Diver and carto tanks in general, so I had no frame of reference.
So these last few builds, getting the ceramic that extra 1-2mm into the base of the Diver seems to have completely, utterly, 100% gotten rid of any and all juice appearing on the Diver pin, on the base or in the 510 connector of the mod. I mean bone-dry, no condensation, no removing the Scuba to wipe off any amount of juice whatsoever. I just left a full tank of Pluid - a.k.a. The Tank Terror of Tokyo - sitting in my Scuba Diver since last night, vaping about 10-12 hits since last night, on my Hippo/Provari, and it is as dry as the Sahara.
So here's a working theory: the ceramics are the weak link in the Diver, along with the Killer, the various gg attys that use ceramics, and any other atty that uses a ceramic - because they are not only made by somebody else, they are almost certainly all made in China, and cannot possibly (wherever they are made) be held to the same exacting specs as the devices in which they are destined to be installed.
Why is this important? Pull out the pin from the bottom of a Diver. Notice that the pin has two different diameters, narrower at the head, and wider towards the base that contacts the 510 connector. I assume that the ceramic has to go deep enough so that the bottom of the ceramic meets and seals with the thicker part of the pin. If the ceramic does not go into the Diver base far enough, it will not reach this thicker part of the pin, and not make a seal. This changes the pressure dynamics ever so slightly in any tank, leading to too much juice feeding into the Diver, gurgling, flooding and leaks. Please note, in this scenario, it would not leak through the gap between the pole and the ceramic, it would find the easiest route out, which is through the pole's center hole.
Most of my ceramics are newly-purchased. If they are a fraction of a millimeter thicker at the base than those made a few months ago, that could mean the difference between an easily-built Diver and leaking nightmares.
I will test this theory further by taking a few of my 30+ CE2s, and filing down the base a tiny bit.
Addendum: I suspect a lot of people, myself included, have been hesitant to press down too hard on the ceramic, for fear of breaking it. I've broken a couple during insertion or removal in my attys that use CE2s, they can be a bit brittle. Note, also, that this would not affect the Killer, as it works differently, and this would happen in any tank - Scuba, SnP, etc.
* no, not "Hercules", "Herakles", don't be peasants!