Coil rating and Watt settings

Hi,

I've read that prebuilt coils always show a higher ohm rating on the device.

Should I still stick to the watt range specified by the manufacturer for that coil? Or can I go higher depending on the rating it shows?

Using Nautilus 1.6 which is meant to be used at 5-7w, it's showing on the device as 1.8 which is meant to be used at 7-12w.