First off my equipment: Riva and Boge 510 cartos. Now my problem, I am having trouble with vapor production with a 50/50 blend of macchiato and dulce de leche. Both juices are 24mg nic, 65pg/35vg. I don't have any problems with any other liquids I've got from this vendors. The flavors are outstanding but there is very little vapor. It seems like the liquid is thick, compared to other liquids I've tried in my limited experience with ecigs. So is coffee flavor just not really compatible with cartos? Is there a way to thin down juice? I really want this combo to work bc it tastes so good. Thanks guys.