I used T3's and Protanks for quite a while - here's a few thoughts:
1 - Once you get a burnt taste, it may never clear from that coil. Best to try again with a fresh one.
2 - I found that the coils often came with TOO MUCH wick, and the liquid couldn't "keep up" with my vaping - that's when you get a burnt hit. I'd carefully pull ONE STRAND of wick OUT, then fluff the rest before use. This made it looser, and more liquid could reach the coil. Worked much better for me, and I was happy finally with those coils.
3 - If you buy a new protank - WASH IT it hot soapy water before use. Many of them came with some "machine oil" from manufacturing that will ruin your flavor
4 - Might want to jump to at least an "Aerotank" or "Nautilus" - these work in a similar way, but have better airflow for MORE VAPOR.
Hope you get it all working!!