Hi guys: I've been using a Bloog cartomizer (808D-1 (what does the D-1 mean? Is there just an 808?)). They aren't lasting more than two or three refills before tasting a bit burnt. I'm using 100% VG juice from Johnson Creek. I've started adding 10% distilled water after someone suggested it. Should I add more? Would using a different type of cartomizer?