Athar - just persevere !!!! - Vaping has a learning curve, we have all climbed
The Cleito tank, is a large airflow - direct lung style device. So you should be breathing your vape down directly in one long pull, and then exhaling. There is no sharp inhale of fresh air to drive the vapor down to your lungs - like with cigarette smoking
You just breath through the device !!!!
Spitting, gurgling and flooding is simply too much juice getting to the coil
Dry-hits and burnt flavour is not enough juice getting to the coil
Vaping is all about getting the coil saturated, and burning it off with correct amount of power to vape comfortably
So the spitting is probably due to not enough power - so the juice is just boiling rather than vaporising
The dry hit burnt taste is due to poor wicking
A burnt taste is not always a sign you have ruined a coil though !!!!
When the flavour drops off, a dry hit is coming - Tank suffer from low pressure build up - Just unscrew the topcap a couple of turns, and look for a couple of air bubbles to come up through your liquid - screw the cap down and the flavour should have returned immediately
As the coil gets older, a build up of carbon will form around the wire inside the coil, this means the tank has difficulty recovering the low pressure build up inside the tank. So you will have to do the above trick more often.
I hope this helps, it is just finding the right balance of power to wicking for your style of vape
