If you really want to crank it up, get the thinnest clearest juice you can. Get some 80/20 and as clear, meaning as flavorless as you can stand, and crank it up.
These "other people" may have gotten a better coil, they may have juice that runs like water, they may be using straight PG for all we know, they may not have any flavor added to the juice.
OR, they might just be blowing smoke about the whole thing! I learned a long time ago to take things my buddies tell me and what I read on the "danged 'ole interwebs" with a grain of salt!