what do you try the liquid at the store in? is it in your tank? how might that tank be different? is it on your PV or one by them? how is that different? there are a number of factors, it may be the need aging, but it may also be you are trying off of something better (maybe worse sometimes something good on something not great doesnt taste as good on something better because well, the subtleties come out) or a better set up?
my eGo V V2 at the same volts as my svd with the same tank... tastes like blegh compared to the svd... everything is the same, liquid, tank, volts, ohms, etc... but the svd just tastes better...