We don't always have the right answer immediately, but know the questions to ask.
Fixed Battery will give you 4.2v fully charged and settle in at 3.7v or so through the longest portion of use until it starts to drop dopn to cut-off point, around 3.2v.
VV can usually be adjusted from 3.0v or 3.3v to 4.8v.
Most basic top devices between 1.8-2.4ohm will work well with these.
What tank/top devices are you using now?
ETA: You have found the right place - now stop listing to your co-worker.
Boosting power and increasing ohms is sort of equal to being where you now are . Everything balances.
If your Vape is cool and you want it warmer with more vapor:
A) increase power - or
B) lower coil ohms
To much power to a to low coil = a burnt/harsh taste
To little power to a to high ohm coil = little vapor and not much flavor
Flavor does change quite a bit at different heating levels(good or bad)