@madstabber, what ohm level are you shooting for? I don't know about wicking with rayon, so you should take guidance from others on that. If using cotton, I recommend a 3mm inner diameter coil. I said I was going to make a new coil for mine tomorrow, but did it tonight (well, it is tomorrow now

.) I used quad-core fused Clapton SS 316L wire, 28x4/36 that comes in at .24 ohms at 3mm, 6 wraps. I am getting a really, really nice vape with that build. Some people like SS 316L, others like Ni80. I can't tell much difference in flavor between the two, though Ni80 will have a slightly higher resistance than SS. I use a lot of cotton and don't thin the wicks much for this deck. I fluff them and trim the excess a bit and stuff more into the holes than I do for some decks.
With bottom airflow, you will get some condensation on the top of your mod - it should be quite light - from the vapor that comes from the AF holes. If you get any leaking, you probably didn't put in enough cotton, or you haven't screwed the parts together tightly.
I want to hear about your experiences when you receive the Zesthia. Again, I recommend watching the Asmodus video and any others you can find on this deck on YT. I will take a look tomorrow and see what there is on YT. Since this wasn't my first RTA, I felt pretty confident but since this is your first, the more you see, the better.