I squonk until I see the juice too and the next hit is dry or badly flavored. Then I squonk again till I see the juice and I think that does it. It might be slightly overfilled at that point but not too bad. I end up needing to take off the drip tip and dry out the inside of it bec it usually gets very wet with juice and at some point it enters my mouth if I don't dry it out...
I sort of get that. This atty at least in my particular 1.5 version doesn't seem to mind the flooding for producing great flavor and vapor, but it will bring the extra hot juice up to the mouth piece in the process when really flooded. I've been using a delrin whistle tip with a tiny hole I won from Super-T with it as an extra precaution. What I am not getting is the dry hits you are and no burning VG juice like say a 306 1.5 when it gets hot. I think my version is draining juice back down better than yours.
My only suggestions which you probably have already tried is don't put it on that tight and try a good PGA soak and blow out (from the battery hole only). Otherwise chalk it off as another slightly faulty ecig item. I'm going to break out my second one tonight on another mod. I'll let you know if it behaves any different than my lucky first one.