Looking good Sthur! For me, I have found that if I use a bit less cotton and position the
coils closer to the air holes than you did it works better. I also like micro
coils built on a 1/16" inside diameter rod. YMMV, but it is something you could experiment with if you feel like it. This one is 0.5 ohms with 27 gauge Kanthal, but it works great at 0.8 ohms too with a couple of extra wraps.