I have had this issue before as well and found out that i was using the wrong heads. there are several styles, also you need to make sure that when you put the new head in that it is snug or you will get a leak that will go to about the half way point. You mentioned that you washed it. Check your lower cap and make sure you didn't lose your oring from inside, this not likely your problem as you said it appears to be coming out the airhole in the bottom. As for the burnt taste that can be an issue with your juice level being a little low try turning it upside down for a few about two or three seconds to wet the wick and try it again. if it still tastes burt you may need to trouble shoot a little (voltage changed or your using a head with a different ohm setting). try lowering your voltage a little and see if that helps. The ohm rating is written right on the head itself so try and find one that works best for your device and write it down and try and only get those heads.