The only time I've gotten a large amount of juice in my mouth from a clearo, it turned out the clear elastic ring had gone missing somehow (the one right below the screws of the mouthpiece). You might want to check on that. I do occasionally get "leaks" on my clearos, but they're probably flooding rather than leaking. I can tap it, shake it, etc, and no liquid comes out, but after
vaping for a while, liquid will end up in the air tube and onto the battery. I think it's wicking too fast and delivering too much liquid to the atty, because it only happens when I'm
vaping. This sometimes causes small amounts of liquid to get on my lips or in my mouth, but the only time I've gotten a large gulp of it, the plastic ring was missing.
The other possibility is that you've got a bad clearomizer and things aren't lining up correctly for some reason. If the mouth piece doesn't rest against the top of the inside post when it's screwed in, there's a problem. You might be able to use tweezers to pull the plastic cap of the inside post upward to make a better seal, but I'm not sure (I'm still a bit of a newbie myself).