Read your update to post 8. 101vape is a good place to buy from.
Here's the point that's kind of relevant.
The Magma got very popular because it was the first (I think) RDA that forced the air to come up from UNDER the coils. Many of the RDA's I mentioned above do the same.
Now, this can be a mixed bag. If you overfill the dripper, it will make them more likely to leak (because the airholes are low compared to your coil). The Magma has a relatively deep well, but if your wick doesn't absorb what you drip, you can get leakage fairly easily.
Some of the others I suggested earlier also are bottom-air-feed. But not all equal. For example, the N22 has multiple small airholes, but they're very close to the cap, so it's a bit of work to get a coil in there that is over the airholes, but doesn't short against the cap.
Freakshow has a single, wide airhole, still pretty close to the cap (haven't got mine yet, on the boat from china). The Lancia airflow looks nice, but that's really going to leak if you over-drip! (Also on the boat).
Out of all the above, the Magma is really a pretty good choice! (Or the marquis, with vertical coils. This is the only one that has the right center-post screw:
https://www.fasttech.com/p/2056506
)