You've gotten a lot of solid info from folks.
I would add the following... my opinions and

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Adjusting coil height will affect flavor and throat hit. Some like their coil lower and some prefer it higher. My preference is ~1.5mm above the airflow (Kayfun's, Dvarw's) but I have a few RTA's where I go higher and also lower. All depends. Try higher and lower until you find your sweet spot and what works best for you.
You can dry burn SS316L coils. They should only be dry burned to a dim orange glow. Never light them up to a bright orange/red, ever. The guy at Adavanced Vape Supply has great info on this.
Coil ID is trial and error. I have some RBA's I like at 2mm, some 2.5mm and others higher. You need to find what will work best for you. So try some different ID's.
Wicking is a total "feel" thing. Getting the amount (thickness) correct in the coil requires some trial and error. Some RTA's do well with a little less and some do better tighter through the coil. It all depends. General rule of thumb is: too loose = flooding OR too tight = dry hits. You should "feel" resistance when moving your wick side-to-side within the coil.
Cotton versus Rayon. Many prefer one or the other. I switch off using both in all my RBA's. If using rayon; it requires approximately 1/3 more thickness versus cotton. Rayon contracts while cotton expands.
As others have suggested, 1st find your sweet spot with what gives you the best flavor and vape in wattage mode. Once you have that set then move onto TC. I vape both watts and TC equally.
With TC or wattage modes I never lock resistance on any mod. Don't need to. Especially if it's a DNA chip. Evolv recommends against it.
I have some GeekVape Aegis Solo's that I run in both TC and TCR modes. I never lock resistance. Works great. Their firmware is pretty standard across the product line as is the UI.
With vaping setups there is no best for all. It always comes down to what works best for each individual. And only you can find what works best for You.
Good luck
