This is a stickler for me, and here's why: We will never change the recipe(flavor) of a e-liquid. If a change occurs we would rather rename the new flavor (since that what it is) then call it by another name. However, that information aside. We will not change the flavor of any recipe. (this leads back to the earlier point)
Keep in mind that more goes into the effect you experience than the e-liquid alone. Voltage, resistance, design of your device, materials used, etc. all play more than a minimal role in the flavor and effect you receive.
This statement is very true. For me every tank i vape has subtle flavor changes which I enjoy very much. I attribute it to the above factors and my ever changing taste buds.