The juice "tasting nasty" is more the result of burning the e-liquid with too much heat, regardless of what battery device is providing the current. It doesn't matter if its a Vamo, ZMax, a Tesla, a Provari, or a Semovar. If you are cooking the juice too hot, its going to taste nasty.
If I am not mistaken, the Provari has a 3.5 amp limit, as do most of the regulated mods out on the market presently. There may be a couple that can push more but I don't know which they are. More that can't do 3.5 amps.
A 1.5 ohm coil fired at 5.2v is 3.4666 amp. Theoretically the Provari will fire that carto up to 5.2v, but I've never felt the need to use such a low resistance coil at that voltage setting so I've never tried it. Good luck finding a mod that will fire one at 6v.
Just curious, what battery device are you using now with the 1.5 ohm dual coil? At what voltage?
The Safe Vaping Power Chart is a useful guideline for those using single coil cartomizers. Using a 1.5 ohm single coil above 3.4v will be in the red zone. Even factoring that a 1.5 ohm dual coil carto is two 3.0 ohm coils working together, anything over 5v is in the red zone.