Weird. I've used protank 3's and the EMOW's that use those coils and I've never had a flooding issue.
There's a few things outside of what you mentioned that you could try.
-Make sure when you take apart to top up or refill that you clean out the center post, juice tends to get in there when it's unscrewed and then it seems like it's flooded.
-Make sure the coil is securely screwed in as far as you can get it. If it's not screwing in properly then juice can slip under it and into the airflow controller, or onto your battery if it doesn't have an AFC.
-There's several versions of these coils. And they all suck compared to the new VOCC ones you can get. They're a vertical coil like the nautilus and made with cotton and they outperform the other types. As a last ditch you could try those.
Here's a link to one of the local sites here, you should probably not buy from them if you're outside Canada, but just so you know what you're looking for.
Kanger VOCC Coils - 5pc - eCigMod Canada | $14.99 CAD
And I really want to say it's just a dud, but you've got two doing it. Did you buy them both from the same place? If so, next time you buy, maybe try somewhere else?