4.8 volts at 3.0 Ohms is 7.6 watts. 8 to 10 watts is the spot you're looking for and a 3.0 ohm carto can read 2.8 ohms so that would give you 8.22857 watts. I think you will be just fine. Even at 7.6 you're close enough to 8 that you will get a nice vape.