1. (re: water for tasting concentrates) Didn't work for me; results were rather unpleasant, and didn't give good feedback of what they taste like when heat is applied and vaped. I have not found a suitable substitute to vaping.
2. (re: 3 month aging) The only time I have a DIY mix last 3 months is because I didn't care for it (and the extra time still didn't help much). I have nothing that "requires" that type of aging. Normal aging for
my palate, varies from same day, to maybe a month.
3. (re: Acetyl Pyrazine) I have never tried using this as a flavor unto itself. I have always considered it as an enhancer/additive. It is extremely potent and a little goes a long way. I use it most frequently between 0.25% to 0.75%.I also concur that too much will give an unpleasant "freto" taste. It is useful with nuts, bakery, and tobacco flavors. I have also just learned that is can also be used to bring out a sweetness in some chocolate recipes w/o adding a true sweetener.
4. (re: search for "gooey") Afraid I have nothing for this one. I have experienced "thicker" and "creamier" and even subtle suggestions of "fluffier." But never "gooey".... sorry.
I am a strong proponent of the "test fresh... taste regularly" school of thought. If I am working with a new ingredient (or ingredients), or a recipe that is outside of my "normal" wheelhouse I
always taste immediately after mixing by vaping about a 0.25mL.
In
my mind, how can I understand how/if a juice changes, unless I know how it tastes to start. I try to jot down a few detailed notes of what it tastes like to me at that moment. What I like about it, what I don't, and what I hope some time may do to it. I do NOT make any changes at this time; even if there are "no-brainer" thoughts. I will include them in my notes (so I stand a chance of remembering them

) but no tweaking yet.
Then, depending on what my general expectation for aging for any given ingredient/recipe being tested, I will taste test it again in 24-72hours. Again, more notes (how it is tasting, how is it changing), and no adjusting/tweaking.
Then repeat taste testing/note taking weekly; until I no longer perceive any more changing to the mix. Only then will I consider what adjustments I may want to make.
This is
not the only way to mix. Some may find this method waaay too obsessive; and have neither the pacience, nor the inclination to spend the time. But, for
me, it works. It tells me how any given concentrate is going to work for
me.
This is a genuine problem when using at very low (less than 1.0%) percentages. One can make it easier to get a more precise measurement by pre-deluting some of your AP. Use 1 part AP + 9 parts dillutant (usually PG or VG) to create a weaker concentrate(only 10% as strong). !0% as strong means I have to add 10 time as much to get the same amount of the original concentrate into the mix.
So, if we use
@Alter's example, we see how this can help:
(using AP at original strength)
5mL X 0.75% = 5.00 X 0.0075 = 0.0375mL
(using AP diluted down to 10% of original strength)
5mL X 7.5% = 5.00 X 0.075 = 0.375mL
Both provide the same amount of actual AP.
Measuring 0.375mL is easier than trying to measure 0.0375 (at least with any precision/potential for repeatability); regardless of whether one chooses to measure by volume or weight.