I'm trying some of my first ni200 builds and notice the same build on my derringer clone performing better than on my subtank, even 30w compared to 40w. Is this due to airflow? My impression was the purpose of air was to cool the coils but TP is confirming that both coils are around similar temperature. The vapor feels warmer with a denser exhale on the RDA at lower wattage. Any suggestions on how to bridge the gap? I like the convenience of a tank reservoir. I also seem to have trouble building a high enough resistance ni200 coil that fits inside my Kraken. I thought perhaps from browsing here a genesis tank would be ideal. Any advice or knowledge would be most welcome, thank you.