Been lurking around here for a few weeks and currently I have a volt with carto's. I just ordered a joytech Ego twist 1000 mah and two Kanger T2 tanks with long wicks. Looks like a 2.2-2.4 heads come with the tanks but I ordered two extras. How long do these last and whats the best way to clean the tanks and heads? I also ordered the power cables and some juice but what is a good voltage to run at with these heads?