Valuable lesson and thanks for sharing. Maybe our physical sense of chemical taste and smell has molecular concentration limits. Maybe some flavoring like peppermint can become ever stronger the more we add, but it may be the Human mechanical limitations which only allow us to detect other extracts ...each at their own maximum "volume". Like some limit of individual olfactory receptor count or just the chemistry of Taste. As you say and we all agree ...subjectivity. Perhaps that "subjectivity" has a mechanical basis.
Men can small one flower, and women cannot, and vice versa. Surely we are all little olfactory snowflakes ...no two alike, but with enough similarities to share the flavor experience ...mostly. My most important finding is that VG/PG vape cleanly as far as coils and wick lifespan goes, so keeping your flav%s low results in less hassle re-wicking atomizers as often.
My point about possible physically organic limits on flavor detection would relate to another DIY concept we share that "pairings" are how to pop flavors. Like you want more Apple ...you can't just add more of the same ...add some Strawberry or another Apple. The "Notes" on the Flavor database can be confusing, but if you look carefully people have already taken most flavors to their high limit % just as Human Nature ...maybe lacking expertise, but excersizing their Curiosity. Thanks for sharing yours.
Some good advice up there ...less can be more. Maybe we should be looking for the lowest level an extract can be detected? I believe our brain fills in alot there. Maybe we could focus more on how these chemicals trick our neurotransmitters into believing there are flowers or apples or caramel? Oh wait we could just look again at "Notes" for bottom % too ...the ELR Database is mighty! Is it not Subtlety that creates desire?