Just to throw in what is working for me.
I am using a NoEgo that regulates at 3.7V with un-protected 18650's from laptop
batteries. One battery last all day and stays consistent until the battery drops below 3.7V. My SGV3 is running 5 wraps and I have a single hole in the top with a tube to bring the air flow up against the coil.
Also something that I have found to make a huge difference in wicking is that the mesh needs to be rolled tight enough that is fits loosely in the spacers going into the
tank. This has made more difference than anything else I have played with. Also my coil ends are too long and I need to make new terminals to be able to bend them in towards the wick as I made them too short to bend in. Keeping the wick low was a mistake as it actually hindered wicking by putting the curve too close to the through holes. Wick needs to be straight and loose going through the body.