For the ego-t, some tips that help me.
-Remove cart periodicly and wipe off any fluid on it and allow air bubble to rise to release negative pressure.
-Remove both pieces inside mouthpiece for a better draw.
-Periodicly remove cart and look into atomizer, if juice is seen at very bottom its best to remove it due to two reasons.
1, when ecig is laid down on its side or turned upside down, that juice flows into air pathways in cartridge.
2, too much in there seems to eventually leak into battery after time.
To remove juice in bottom of tank atty, i turn it upside down into paper towel and shake/flick it until juice is gone, then wipe out with a cuetip.
BY doing this I never have juice in the mouthpiece or in my mouth.