I have not received mine yet, but a few tips from my side as I have used tanks a lot:
1.) prefill your carto, not only the tank and let it sit for at least 10 minutes;
2.) don't use too high voltages, you will burn them 4sure;
3.) when putting on the drip tip don't close the drip tip hole or the atty hole as you will push too much liquid in the carto and flood it;
4.) when refilling the carto, don't get juice in the hole, it will ruin it.
5.) stiff draw means: the poly is too much saturated, toss it!!
6.) when making holes: if the carto get's too hot because of the drilling you have a change to burn the poly;
7.) don't press the fire button ever before making sure you have done the above (dry carto burn once means burned 4ever).
EMonty