Hey, i hope you love your subtank mini coz i did! Maxed it out before i got my Zeph. What i used on my subtank mini was 28g 10 wraps 2.5mm diameter. I went for the high ohms 1.1-1.3. Coz i was using a kbox mini at the time and the batteries are fragile. So high ohms low wattage and higher voltage for me at the time.
When i got my ipv4s i started to take it to the next level, drilling the wick holes, making different coil setups, really going sub-ohm builds. One i could share with you is, u may go dual coil on this by coiling your coils instead of the usual horizontal coil setups i did parallel. Meaning the coils wicking pass is not aimed straight to the wick hole. Like this,
So u get more airflow, no hard draws, more clouds, more flavor. Its a little tricky to do. But worth the try if you would wanna get some crazy ideas.
I wish you all the best!