All good tips here, one more would be if you are using 100% vg and a tight coil especially in cooler weather dialing it in is much harder. Everything mentioned here becomes much more critical, amount of COTTON, positioning, etc. Spaced coils are more forgiving with thicker juices (imho) even then careful not to choke it. I have come to like a 70vg-30pg much better in the winter months being outdoors. Hope all this helps just hang tough it will all pay off. If you are running VG try lower ohm .9 good luck friend.