Yeah, I have some "one shot" flavors, but I have found I can usually improve them. I won't vape anything much until a mix (one shot or not) has steeped about a month. I've figured out that is the best "steep" time for my longest flavors, and since I do use some of those flavors in most of my mixes, well, I just mix, try to forget the horror of mixing that happened (usually at least one "horror" will happen, although not yesterday, it went smoothly) and hide them in the closet, shaking occasionally. That way, I know when to mix based on how much eliquid I have to vape, and I don't have to fret, worry, overflavor and etc.
I also find it puts me on a good rotation of flavors. Also, I am a pretty "light" DIY person, in fact, it's quite rare for me to mix above 8%, and a I am a rather "reluctant" sweetener, although I do use it on occasion.
I do think most mixes, even one shots, do benefit from aging, although I think it's probably easier to "age" the liquid while you vape it as most of them are "decent" but not "phenomenal" right out of the gate.
I look upon it as "delayed gratification." LOL. I will admit, there are some new flavors I did as well as adding PEG400 to the mix, which makes me want to try them right away but I'm pretty certain I will be disappointed if I did that, so I won't be bothering with that.
Anna