Evic mini is a great little mod (as is the Sigelei 75), and the .4 coil, with a sweet spot of around 50-55w IMO, will be fine. The .2 it'll still handle,but you'll be right at the top of the devices capabilities. This'll chew through your batteries for you and stress the device if you're doing it all the time.
It's like my car will do about 120 mph, but I don't do that all the time. If I did it'd probably break pretty quickly. Similar principle applies.
Again John is quite correct that the Cleito chews juice, as does the Crown, Herakles plus, TFV4 etc etc. Massive clouds= massive juice consumption.
As far as I'm aware there are no TC coils for the Cleito yet but I could be wrong. Locking ohms has nothing to do with the tank as this is all down to your device.
Have a look around and see what works for you, just remember that if you're after big vapour production that your juice consumption will increase a lot.