My honest opinion... I've thought about this for a while before posting.
I bought the zap because it came already setup plus they included lots of prerolled, preoxidized wicks and kanthal. There's also a video of Zen himself, showing exactly how to set it up. I figured I'd try it out and if I didn't like it I could sell it in the classys for a small loss and I wouldn't be out too much.
At first I was really shocked at the airy draw, it was way more open than I anticipated (and I anticipated it to be open) But I did as zen directed and slowed down... I took long, slow draws and the open draw grew on me. I decided to keep it. I've been using the stock setup since I got it, for a month or so now. At the time, I had the zap plus a did clone and while I had to keep recoiling and adjusting the clone over and over to try to keep it working, the zap worked great with almost no adjustments every day. My plans for this nice, cold, rainy day are to take out the insulator and rewick it with a fatter wick (my own).
As far as trying to tighten the draw.. I think it would be hard to make the air hole smaller and I don't think I would like it if it were smaller. I put a piece of tape over it and poked a small(er) hole and the draw was wayyy to tight (rubber ball in a garden hose tight). I went to
surevapes and bought one of their SS drip tips that has a narrowing (the pawn) and it seems to help. Great drip tips btw... they're only $3.50 and the one I got looks awesome on the zap!) I plan on getting more.
Learning "how" to vape it was key for me. Once I get the new setup in it, I'll edit this post to say how I did.
30 minutes later.... I took out the insulator and combined two of the 400 prerolled wicks that came with it. It works great! Much better! The draw seems to be "fuller". My ohms are reading 1.5, which was what I was shooting for. The stock setup was nice to learn on but taking out the insulator and doubling the wicks is night/day. Very very pleased. It also seemed to tighten the draw quite a bit. I recently purchased a real DID and am noticing that the draw on the ZAP is now exactly the same as the draw on the DID.
As pbusardo said ... I just feel in love with my ZAP all over again!