Hey, I am fairly new to vaping. I have been doing about 3 months. I have 3 or 4 eGo batteries, 2 are VV. I am having the hardest time getting consistent vapor production. I have 2 Kanger ProTanks, a ProTank 2, Protank Mini, and Evod. The ProTank 2 and JoyeTech VV battery seem to work best, but...