Well, I cleaned the coil and rewicked the Serpent SMM and then... rewicked it again.
Not sure if I really had a leak or
juice got into the airflow ports when I (over?)saturated the coil and wick before putting it back together and filling the
tank.
Didn't leak right away but after sitting about a half an hour or so. Emptied it and did the wicking over to be sure.
Tried my Sugar Bear mix...meh. To be fair, I should give it another mix when I get some CAP Cinnamon Danish Swirl as I couldn't get that when I ordered and subbed TFA Cinnamon Danish instead. Might make a difference.
Also, there are probably two dozen other Sugar Bear formulas to look into as well.
I guess my latest wick job could be muting the flavor, but it was about the same on the leaky one... meh.