It would help if you tell us what resistance coil and how many watts/volts you are using. Typically, the coils will pop when the juice is heated to boiling/vaporizing temperature but there isn't a complete vaporization. This will result in the snap, crackle, pop sounds as well as some hot juice popping on your tongue ( spit back). Usually I start at the low end of the recommended range and slowly start moving up in small increments. As the wattage (I go 0.2-0.3 watts at a time)goes up, the vaporization is more complete and the crackles go down. That should also alleviate/eliminate the gurgles too. I would not suggest going very much above that point, you might end up with a dry hit (not enough juice on the wick, burnt cotton) and that is one nasty taste, take it on faith and don't do it.