I have the Smoke micro one and I'm just starting to get into rebuildables but I'm having a lot of problems with building on the smok micro tvf4 because it's so small and I tried using kanthal A1 and got the coil perfect but even with the screw tightened all the way down it won't hold the wire. Can someone tell me a good tank to put on here with a fairly easy rba? I was thinking the regular tvf4? Thanks for any help.