Drummer I feel your pain... When I got into vaping I had a K101 running a Smoktech UDCT with the filler material it was awesome didn't leak once! Replaced the carto (3-4 times with replacements from smoktech) leaking so much. I switched to Protank Mini V1 one flavor wick out awesome, but had an awful taste of metal from the tip I'm guessing. Got a Protank 2 had a 1.8 ohm coil one flavor wick out (at the time I had just switched to 100% VG juice) and it was leaking and flooding a lot, wasted near 3 tanks of liquid and getting the taste of metal. I too was getting very upset and wanting to quit. I swapped out the drip tip for an acylic one and the 1.8 ohm head for a standard 2.5 ohm reisistance head, keeping all flavor wicks in this time and problem solved. I have no leaking and no flooding at all 5-6 tanks in now and no bad metal taste in my mouth.
All in all, I don't think you should give up. Just tinker with it trial and error and I'm sure you will find the perfect set up for your needs.
All in all, I don't think you should give up. Just tinker with it trial and error and I'm sure you will find the perfect set up for your needs.