Yeah, that long you need at least an 18mg (1.8%) nicotine solution or equivalent what I call exposure per volume/watts. So I would up your nic concentration up to a 6mg (0.6%) at least for your device, if the throat hit is a bit more harsh, just have to lower the watts down to like 30 to 35watts to adjust for it. Also, words of encouragement, when I officially went into I'm going to vape instead of smoke mode when I quit, I dual used for almost 3 weeks, though if you your cig usage is increasing, the extra nic will help, still I would suggest also look at the NET and WTA liquid/base offerings and add, at least with WTA base, some drops into each tank. But remember, even if you can't quit smokes entirely, trying to get down to say a couple a day (wake up and before bed, or after high stress situations), feel the urge for a cig, start vaping first, then after a few minutes, still feel the urge, smoke only 1/3 or 1/2 a cig, then go back to your vape, that should be plenty to equalize your alkaloid levels in your body to kill off the urge.
Don't think every cig you smoke is a loss, think about every cig you didn't have smoke during the day as a victory, have to retrain your brain and thought processes.
G/L and keep at it.