Whoops, I quoted you
You are correct in your assumption. Nicotine is a strong base. PG is basically neutral. Often critic acid is added to balance the pH. Adding most flavorings is going to increase the pH further, which is great for nicotine absorption, but not so good for throat hit. A lower pH would give a better throat hit, but you would probably vape a lot more due to the lower absorption. A lower pH would also tend to degrade faster, meaning your solution would not last as long. Solutions kept away from light, in dark containers, as well as refrigerated should be good for at least 6 months without degradation.
Also, remember that just because something is considered safe to eat, does not mean its safe to inhale. Organics can act differently via a different route of entry. PG inserted in your ..., makes for one hell of an enema... lol.

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