I have made a small observation that I hope one of you can confirm or deny. I am using a carto tank with pre punched smoketech 2.ohm carto. I started using it on my darwin playing with the wattage/voltage until it was just right. I wound up cranking it all the way up to 12.7 watts which on my darwin was reading 5.2 volts. Delicious vape ! Now my normal go everywhere device is the Provari so when I switched to the provari and copied the darwin's setting of 5.2 volts, it seems like its firing more , burning hotter and needs to be turned down . Why at the same voltage is the carto acting different?