Can you post some pictures of your setup? When I've gotten bad taste, it's been for one of two reasons:
1. No / bad wicking
2. Hot leg
The bad wicking can be because from the roll of the mesh amongst other things. The hot leg was something that plagued me for a while — the coil would read perfect and fire evenly, but the top coil leading to the center post was always hotter, and furthest from the
juice so I'd get a bad metallic taste.
Maybe try dripping some
juice on the top part of your coil / wick and see if it tastes better? That might let you troubleshoot it better.