I think even subohm tank is too much for wax oil. My preferable setting is Aspire Nautilus @ 1.5 ohm + 10-15w power. Probably won't give this a try but thanks for share :)
Get mixer and either use Microwave or double boiler method to mix the wax with mixer. I personally don't like EJMIX due to heavy chemical taste so get Puff Majic or MixerWhite mixer instead. I prefer MW cos they have tobacco flavor with nicotine. Go check it out before you pull the trigger.