Will,
This unit has a 2.5 amp limit. The Provari has a 3.5. there is no comparison. Running 6 volts with a 1.5 atty gives you 4 amps and 24 watts. This unit cannot handle the load. It mostly likely is stepping down the voltage to work and you really arent vaping at 6 volts. Checking ohms on an atty/carto is important. Sometimes you dont always get what you order and also the ohms of an atty/carto change throughout its lifespan.
"Now the next thing I would be looking for would be to increase the watts instead of just the voltage"
There is no such thing as adjustable wattage. The wattage is a result of the volts & ohms. You can only adjust the volts and use a different ohm atty to vary the watts.