I am a rank newbie so take what I say with a cow lick of salt.
The eGo-T is the only unit I have ever used so my vaping experience is very very limited.
I found that a very light draw helped a lot, I was pulling on mine too hard, which flooded the unit, and the mouthpiece and made for very very tight draws, so I lightened up on how hard I pull on it.
The mouthpiece end of the tank has a plug in the end with a hole in it you draw from, you can take a paperclip and pull that out, you will find another one deeper inside, I pull that second one out, throw it away and put the first plug back in, that also eases up the draw a lot.
Taking out that second restriction, and drawing lightly has fixed most of my issues with the eGo-T, no more juice in the mouthpiece, no more hard draws, no more leaking which turned out to be nothing more than a flooded unit.
Hope that helps some