I received my wick, wire and mesh today. Now I know what 400 mesh looks like, what I was trying to use previously was probably 100. Anyway I did a U shaped mesh in my smok ViVi and it works pretty good, but on my second ViVi tank I used 3mm silica and followed Optimo's recommendations for wrapping a good coil(loose the untwist wick). I believe I now have got something good here. I would like to say how it compares to a single wick Phoenix but I don't want to start anything. I will try a vertical wick next time as it is much easier to do. Thanks again to Optimo.