For some reason it has flooded probably a quarter ml both times I've filled it so far. However, it has just occurred to me that, it
might be a problem similar to having an orchid, and top fill cap. After closing the air-flow port off, and opening the fill port, then closing it, I might try doing a few pulls to see if this will help the vacuum pressure a bit. Let me try it, I need to fill it now...there was still a little flooding.
See the pic below. I have now realized that since the air-flow is closed, there is not much pull, except what air can squeeze through the metal ring so I don't know if that technically "worked" like it does in an orchid top fill port, but it didn't leak quite as much. I think getting it on a mod as soon as possible, putting one finger over a airflow, and then blowing what leaked out, out, then you can start the vacuum going again once you fire it. This scenario might be changed if the airflow isn't all the way open, I don't know, it is still in the "preliminary testing phase"
I does need to be filled more often the lower ohm coil you put in it obviously. The capacity isn't that of the original Lemo. I never had a Lemo Drop.