You have got good advice so far... one more tip (and a question) For "thicker" juices I just mix with some cheap tobacco flavor 50vg/50pg (It is also stronger 18mg nicotine to boost "weak" juices) You mentioned "washing the tank" (I assume with water) Do you mean the coil/wick part also? If so, you would have to dry it very well before using or you just be vaping water. That would explain no flavor.
Yes, I washed with hot water. I did realize that about letting the tank dry. I didn't think of that until I started this conversation. Thanks!!