The 3.3 would be volts, the 6 would be watts. This is a very low setting, What kind of tank do you use this could also be an issue. As for dehydration you should always drink water when you vape. The PG will dehydrate you if you don't add water into the mix. My currant settings are 3.9 volt and 9 watts with a Aspire Nautilus tank and it works really well. But different tan act differently you just need o find the happy spot.