The ares can handle a fairly large diameter coil as long as it's not raised too far off the deck.
But honestly, if you have a target resistance I would just play around with coils, materials, diameter (I do happen to think a larger diameter coil works well with the Ares due to what is sitting on top) but you can really just experiment and see what works well for you. I think 2.5 is the lowest I've gone with mine, and that works well, too.
Good luck, and I like an approx. 1.0 resistance although in TC that may be SLIGHTLY less important but around that tends to be what works well for me, and certainly in that atomizer it's a nice balance of flavor and clouds (again, for me). Etc.
Anna