Last night I set the Diver up for wick lined up to the hole. Seemed to work well with 70/30, but I topped off with something else that is 50/50 and was getting not-quite-dry-but-definitely-not-wet hits - harsher hit, less flavor in very short order.
Today I shifted from in-line to 90-degrees out and things are MUCH better with this slightly thicker than 70/30 liquid mix. Still a very slight gurgle on the first draw but every draw after is better. After a bit of use the coil has "settled" a bit. At just the right voltage the hits are warm, smooth and VERY tasty with lots of vapor.
My guess is that
three setups are worth considering:
1. Wick-in-line: Wick at 0/180 degrees, in line with the hole, for very thin liquids;
2. Wick-at-90: Wick 90 degrees out/perpendicular to the hole, for thicker liquids;
3. Wick-to-edge: Only some portion of the edge of the wick touches touch the hole, offset determined by user, allowing for some flexibility in how much of the wick is near or on the hole to increase/decrease liquid flow and wicking.
Pondering on it, another factor to consider is how much the wick is trimmed / how much wick is sticking out from the ceramic cup. Too much wick could result in poor wicking, too little could result in easier flooding.
Combined with the (apparent but not verified by me) need for NR/R/NR
coils and depending on one's views, the Diver looks to be either very flexible, or very finicky. Probably both.
Prepping NR/R/NR
coils looks fiddly but do-able. FWIW, I found that the included 2.0-ish ohm coil uses about 1.5" of resistance wire. Based on that I have three spools of wire on the way: 34ga Nickel NR wire, 34ga Kanthal (which should make for a ~3.3 ohm coil at 1.5") and 36ga Nichrome (which should make for a ~2.8 ohm coil @ 1.5").
... to the Vape Cave, Robin!
I'm pretty sure if I can get one cut down ... A Raven will be in my precious BB tank by the weekend! ;-) BTW ... Not sure why it's called a "carto" ... Carto size ATTY is more accurate! ME LIKEY!! 
