I'm using a SI Volt KR808 and have a question about the amount of vapor produced. I'm getting A LOT more vapor from the prefilled cartos than I do from some generic blanks (not bought from SI) that I bought a filled myself. Is this due to the e-liquid or the carto? I get about the same from vapor from the prefilled despite different nic levels (I bought both 24mg and 18mg cartos from SI). The e-liquid I'm using is 16mg. Would the lower nic level have anything to do with vapor production? I'm just curious as to if I should order blanks from SI to get better vapor or if I need to reevaluate the e-liquid I'm using? I know that SI's e-liquid is 100% PG. The other e-liquid is "PG based" (according to the website of the vender I purchased it from, but no definitive statement about PG/VG ratio if it is a mixture). Thanks in advance for any info!