Well I've been trying to point you toward several different things I thought would work well for you. Sub-ohm can be for flavor chasing too, but the builds and airflow are different. Again, 0.45 to 0.7 is a good place to start, with the wire I told you about, or that same size of wire in a different brand if you have a particular brand you want to use. Yes, the type of metal, the size and number of strands of wire, the number of loops, and the size of the loops are what determines the coil's resistance. There's a lot to learn when you try to take on everything at once. My own progression through what you are trying to do took at least six months, and I was reading here at VU and learning that whole time. Oh and you can do sub-ohm vaping in a SO tank, an RDA, an RTA, or an RDTA. Just not the ones that are labeled MTL.