The HE4 is fine for your Pico. As
@Cf11 points out, you're good to 60W. With a 0.5 ohm coil it's unlikely you'll ever even get to 60W. Besides, if you are running all day at 60W or more, you'll need either a 2 or 3 battery mod, or several charged batteries (in protective cases) in your pocket as you'd run through a single battery fairly fast.