1) Have a proper ohm reader, clapton
coils can run pretty low in ohms, that xcube2 should have a low ohm limit as the minimum it will fire so be aware of that limit, other than that it will have enough power to fire the coil. Your amp draw the a regulate mod will be calculated Wattage/Lowest Charge State = Max amps the battery must provide. Most batteries the lowest charge state per battery most mods will fire is in the range of 3.2v, being a series mod with 2 batteries, that number becomes 6.4v. So example, 100watts/6.4=15.625amps max draw both batteries will have to be able to provide safely.
2)
Steam Engine | free vaping calculators <---This is a nice set of vaping calculation tools, most coil builds you will do just use the coil wrap tool, yet with a clapton, use this calculator from the site ->
Wire Wizard | Steam Engine | free vaping calculators
3) To be safe, using the variable of 2mm inner diameter, 8 half/7full wrap config single coil should land you in the 1.06ohm range, a 5/4 wrap will land you in the range of 0.68ohm range (these are only simulated guesses but most time pretty accurate), should operate in the 10-20watt range just fine, in a dripper you could probably get up to 30 to 40 watts, go dual coil split your resistance in half, 0.53 or 0.34 respectively, wattage will be in the 20-40watt/50 to 80watt ranges respectively by rough calculations. Wattages can also be adjusted to your preferred taste and throat hit, clapton in a tank like the tfv4 is probably going to have a hefty throat punch, but flavor is going to be off the charts.