I bought a smoketek 1.5 dual coil tank and put it on my Riva 510 thinking I had solved the problem of topping off those little plastic cartridges. Seemed like I was going through juice too quickly that way. Well, now I have the opposite problem: have been using this for 24 hours and the juice level in the tank has not gone down one tiny bit! I get some vapor and flavor, but takes a long hard draw to do so. Where am I going wrong? At this rate, I'd never have to buy juice again!