What battery are you using them with? Yes 2.8 - 3.0 ohm will work but if you aren't using high enough voltage with it you'll be getting a weak
vape. I use the 2.8-3.0 Ce2 at 4.2 volt and up, usually at or above 4.5.
If you're using a proprietary battery like the Ego that is around 3.4v then I'd wait till they get some lower ohms in stock. They might be ok on a true 3.7 battery but the voltage is going to drop with those as the battery is drained.