I wasn't familiar with your setup, so I looked it up on You Tube. The Tinker is a 3-battery regulated mod made by Wismec, and comes with a sub-ohm tank called the Column.
You say you have e-liquid leaking from the bottom of the column, so I take that to mean the leaking is originating from the 510 connector (?). That's kind of an odd place for e-liquid to be coming from. My first thought was it could be leaking from the air control (ring) area.
How much leaking are we talking about here? Is it a drop or two, or are we talking about liquid running down the side of the mod?
Have you noticed any gurgling sounds or e-liquid within the drip tip (mouthpiece)? This usually indicates the tank is "flooded". Flooding can result from a number of things. It could be from normal condensation building up from the vapor produced. It could be from drawing too hard while vaping; often a more gentle draw works best. It could be from a damaged seal or o-ring within the tank. It could be from improper seating of the coil head itself.
Your specific coil being used has a recommended wattage range, and that information is inscribed on the side of the coil. That recommendation is 30 - 100 watts for this coil.
Improper Filling: When filling your tank, you have to be careful not to get juice into the center air tube of the tank. This center tube is the air passage. When you take a draw, air comes from the bottom of the tank, through the air passage and into your mouth. If you get juice into this passage way, your tank is flooded.
Over Filling: If you over fill a tank (specifically a top coil like the ones that come with the starter kits and gift boxes), the wicks can become over saturated and just like a rain cloud, they will leak into the air passage. Once this happens, you have a flooded tank.
Pulling Too Hard: As I mentioned the wicks absorb the juice in the tank. As you pull on the device, you cause a vacuum effect that pulls juice into the wicks. If you pull too hard, you can pull in more juice then the coil can vaporize. If this happens, the juice leaks into the air passage and you have a flooded tank. Try a gentler draw technique.
Temperature: E-Juice is a viscous liquid. Which means that as it warms up, it will thin out. And in the opposite form, it will thicken when it gets cold. When it thins, it is more difficult for the wicks to hold back the thin juice. This usually causes the wicks to over saturate and, you guessed it, it will leak into the air passage and you have a flooded tank.
Damage: There are o-rings and gaskets used that can wear out with usage or come out of normal position. If certain ones fail, or get lost, or get moved out of position, leaking will occur, causing you to have a leaking tank. Other than accidentally losing something, damage can occur when its carried in a purse or a pocket or by over tightening the tank to the battery. Over tightening is a very common cause of leaking due to the damage it creates.
Why does my Tank Leak and what can I do about it? | E-Cigarette Forum
6 mg nic is not too low for a sub-ohm tank, in fact it is about right. Were you a previous smoker? Nic concentration should be gauged to how heavy of a smoker you were. The amount of nicotine has no bearing on your tank leaking.
For e-liquid, the typical nicotine recommendations are generally determined by how much you smoked, and are as follows:
1/2 pack per day or less = 6 mg nicotine
1 ppd = 12 mg
1 1/2 ppd = 18 mg
2 ppd = 24 mg
Should you choose to use a sub-ohm juice attachment (coil less than 1.0 ohm); drop the above recommendations by half.
