One thing that I found to help-
-Get some distilled water, draw 1 or 2 drops with a dropper then blend into
tank while filling with
juice, or add after the fact and shake for 30 seconds.
-This thins the
juice out enough to assist wicking and flow with very little effect to flavour and strength.
-Distilled water is used because minerals, flouride and clorine are not really desirable things to vape and are found in both tap and bottled water. these jugs are fairly cheap and are idenified by "distilled" or "demineralized" printed clearly on the label.
-High proof booze like vodka could possibly be used but I have not tried it personally, PG might not have enough thinning effect at only 1 or 2 drops.
And, as already mentioned, a couple minutes for everything to soak in are always necessary.