I'm using loose organic cotton. I roll the wicks to the size that they just are able to pass thru the coil without hardly touching. I used them on my ITVV3 and tried 6-9 watts. Same problem. I will try to add a little on top to see if that makes a difference. If it is wick size that's the issue, is it more likely that the wicks are too small or too big? Also, the juices I use are either 50/50 up to 100VG. What mix to EVODS prefer?
If it is leaking then not enough wicking, if it is dry hitting then too much juice. juice type does not matter as long as you have the right amount of wicking in place. Although thicker juice will leak less with less wicking. I personally use 65/35. Finally once they start getting low (almost out of juice) they tend to leak a tad anyway because there is not enough juice left in them to maintain the vacuum. I actually like this feature, because once it gets gurgly, you know it's time to refill, which prevents running it dry.