So if I understand correctly, you are getting a satisfying vape at .5, but you want to go lower because your buddies have? I'm so confused as to why you would want to go lower for _that_ reason but in the same breath, I'm glad you asked here and not the guy running the .1 build. At .1 (if it's actually at .1 flat) he's pushing 40+ amps, and he's most likely doing it on a 30 amp battery.
Stay at what is good for you. Don't get consumed by all the "extreme sub-ohm" hype. I get that it's the "cool" thing to do, but use your head and stay safe....best of luck..