Hello I'm not a new vaper, but recently got the above rta.... now my first build on it came out at 1.9 ohms, high , I know, but I really enjoyed the flavour only at low watts... vaped whole 5 mm tank full. So this morning decided to build new coil, at lower ohm... but got few vapes of flavour then burnt dry hit.... so built another coil, same thing again... third time built a 1.8 ohm coil, less cotton wick etc... lasted a little longer but now tastes burnt too.... what the heck am I doing wrong?? Is it possible that my juice is bad in this tank now, and would I be better cleaning it all out totally? Any tips please ....