Hi i'm having problems with the subtank nano and the 1.5ohm vertical OCC coils that i like to use. been using the vertical 1.5ohm on the subtank MINI for a couple weeks now as i prefer mouth to lung inhaling. only just bought the subtank nano, but when i attatched the vertical 1.5 to it, the tank won't screw onto the air flow base properly. its not far off, just doesn't sit flush like it used to with the horizontal 1.2 that came with it (with the nano), maybe half a mm not flush, i haven't tried it with any juice yet, just wondered if the tiny gap mattered much? I'm fairly new to vaping so its pretty confusing haha, has anyone else noticed this problem with the nano and the 1.5?