I have the serpent mini 25 and for the life of me can't get the airlock problem to go away. My Engine, on the other hand, performs amazingly. After every fill I so need to turn it upside down and give it a few shakes to get rid of the excess juice, but a few drops is nothing when the rest of the tank vape is so smooth. I love it.
Although this is an old post, I had the exact same issue with my Serpent Mini 25 which i owned for over a year but lately i just could not get the airlock issue sorted and kept getting dry hits. Traded the SM for an OBS Engine and have been very happy so far, Flavor is great and no leaking and easy wicking.
Still want to try out the single coil build as i love single coil but for now the dual coil will do. Single coil just uses so much less battery power.
Rewicked my OBS engine last night for the first time and did it twice and have this weird issue where i can vape but when i pick up the vape again later at times will get like a dry hit, almost like when i fire i get like a mouth full of smoke as if the coils are bone dry, pull a couple of times and then she is operating again.
Will rewick again tonight cause im doing something wrong it seems lol but im sure ill get the hang of it after reading this thread.
Cheers.