It could be a number of things, - if you get the burnt atty taste it does sound like its either not getting enough liquid or too much ( i know it sounds weird on the too much, but it can happen )
So you might wanna try blowing it out, then dont do anything else to it ( dont fire it up etc ) and just drip one drop in there, vape see how that is. If bad, add another, - and once its there see how long it goes for. If that works, its because you are adding too much or too little into it when doing "my process". Remember you have to find your way of doing it or it wont work, i dont know the size of your dropper bottles outlet nor which kind of liquid youre using.
For me for instance, if i add 5 drops everytime i think it goes dry, i end up flooding it, and it tastes bad. if i only add 3 drops everytime, i do have to drip more, but it does work perfectly.