Several issues going on at once it sounds like, one being air flow on the Provari, don't tighten it down on the Provari, just enough to make contact.
Second, how long have you been using the atomizer head inside the tank, these are replacable and also could use some simple TLC and care =)
First of the simplest maintenace steps, about every 2nd refill on the tank, take out your head from the tank and run it under warm tap water, run it across the wicks and down through the chimney, this will clear up a lot of gunk out of the wicks and rinse the coil bringing the head back up to a respectable output, darker and sweeter liquids, do this every refill
Second or intermediate level care, soak the head in vodka or everclear for about 20 minutes every week, then rinse out under tap water like mentioned above, this loosens up and disolves alot more build up
Third this is a little more advanced, but is still relatively simple, after an intermediate soak and rinse, take the head, attach it to the base, then gently wiggle the air chimney off, this is only press fitted in, do not lose the upper seal, leave it attached to the chimney stem, then attach the base and head to your battery, set the Provari to lowest voltage, then in slow 5 second pulses, fire the coil up, it will sizzle and burn off the water first, then you'll see it start vaporizing gunk and carbon out of the wick and off the coil, then once this is all cleared, you'll start to see the coil glow, continue to slowly pulse the coil until it glows evenly, once this happens, press the coil cup and air chimney back together, reseat the top seal back down to where it us just gripping the top of the coil cup no more, then rinse the head again and let sit and air dry, put a previously cleaned head back into service or put a new head into service.
This maintenance should extend the life of your heads upwards to a month even 2 months depending on type of juice you are using with it and keep them in tip top performance as long as possible, upon popping the chimney off, if you see any dark crystalizing in the wicks, or the wicks are desintigrating, other funky stuff beside being dark and gooey looking before dry burning them, toss them, they have reached their life expectancy.