Dont give in, try 55 watts with the air flow fully open, if that`s better take it up in 2 watt steps. If that`s no better drain the tank, remove the wick and dry everything off, including blowing down the drip tip. If you used all of the cotton supplied, try with about 2/3 the thickness, some manufacturers have a strange idea of how much cotton it takes to fill a 3mm coil, rebuild the atty, refill and leave it for 15 minutes to soak the wick, try at 50 watts and increase in small amounts until you get a decent vape.
You dont always need 70 watts to get a decent vape out of .19 ohm coils, you should start feeling it at about 55, then it`s personal preference.