I'm interested in any DIY'ers that have juices stored for a month or longer and if they see/taste any consistent flavor loss, and if they noticed the same behavior in similar time periods with big brand store juices.
My experience has been that my own DIY will "fade" faster than commercial blends. My opinion is that flavor longevity is affected more by evaporation than oxidation.
Oxidation certainly degrades nicotine; adding harshness and peppery notes while diminishing active "strength" which can alter the juice's peak profile. But, I postulate that more of what we sense as loss, is actually caused by the evaporation of the volatile compounds (compounds that easily become gases/vapors... even at "room" temp).
This can be seen, and even encouraged, a couple different ways by vapers:
1. Whenever we leave the top off a mix (either DIY or store-bought) to "allow" ethyl alcohol to evaporate.
2. Using heat (warm water baths, microwaves, nuked dry rice, etc.) accelerates this process. (Some mixers will even go so far as to leave certain flavors OUT; only to add them AFTER their choice of speed steep or extended shelf time.)
So, it stands to reason, that besides affecting the unwanted stuff like alcohol; it is also going to affect wanted compounds that are wanted/needed for optimal flavor. I read somewhere here on ECF someone suggesting an experiment that got me thinking about this. They suggested that you take a puff of your chosen flavor and really focus on its taste. Then do the same thing but hold your nose closed so you are force to inhale, then exhale, through your mouth. Notice how much of the flavor is lost.
You can take this even a step further. Do it with a flavor that is more light and aromatic. Then try it with a deeper/heavier flavor like a custard.
My personal experience has been that certain flavors, like lemon, certain strawberries/raspberries, and light florals like honeysuckle, dissipate rather quickly (2-3 weeks(ish)). While Other flavors like tobaccos, vanillas, and custards have no problems hanging around for more than 9 months.
I also believe things such as storage temp (warmer=faster), container material (plastic vs. glass, soft rubber eye dropper tops vs. solid caps), and excessive head space will all contribute to this effect.
So why does this affect DIY faster than commercial products? I am GUESSING that this is due to the common practice of High(er) flavor mixing. More flavor means there is more volatiles present, and can be lost, before it is really missed. How may times have you heard a mixer say they have/do cut commercial juice with unflavored and actually prefer it; or at least find it as good as the original.
@Sugar_and_Spice mentioned this very experience a few posts back.
I find that I get a much better overall impression of flavor with my RDTAs, particularly my Griffins.
I love my Griffins! They have been my favorite until I finally got around to trying a Vaperesso Gemini I had purchased back at the beginning of the year. I have to say that my Griffins have taken a back seat to the Gemini.
To me it has better flavor and vapor production.
I am not sure why as they are similar in design. The only differences I can see are the chamber cover of the Gemini is tapered vs. the flat top of the Griffin. Which leads to the shorter and slightly larger diameter(?). Not sure.

Both the Gemini and the Griffin 25 have the top airflow, in addition to the normal bottom AF, so the chimney is double walled.
I find a big difference between my tanks, and my RDA's, using the same coil build, and wicking material.
That has been my experience so far too!
The only difference would be the air ... can't adjust it on the tanks I have, but even playing with the air on my RDA's can't give me the same flavor.
I do notice a big difference in "heat", which I think kills some flavor.
I personally found that I have less change in flavor from air adjustments than temperature adjustments (though if I go to extremes I can "dilute" the flavor) too. What else I found interesting is that the exact same set-up (tank, coil, wick) will have different "optimum" temperature/power settings for different flavors.
I'm experimenting with other coil builds, and I'm going to try some longer drip tips.
That may cut some of the heat, and bring out more flavor in the RDA's
I wouldn't buy a bunch to start. It
will cut the heat of the puff but I am guessing that it is going to reduce the flavor; not increase it. The reason I think so is that, as a tank user, I have found that the "more flavor" producing tanks I have, compared to the "less flavor" tanks, all have shorter/wider (not as long/tall and wider diameter) chimneys (the little tube that attaches the chamber cover to the top/drip tip.
Please keep in mind that I only use rebuildable tanks; I have no idea how true this might be for tanks that use the ready-made coil heads. And, of course, your experience may be totally different from mine.
