TFA Vanilla Cupcake is going to taste similar to FW Yellow cake. You are getting Vanilla and a Cake Bakery taste with it. No Icing flavor so it is probably not going to blow you away.
If you sub-ohm on a dripper you especially don't want to do 10% of it.. Most concentrates will taste awful if you mix too much or you will not even taste them because they will kill your taste buds and mute your flavor pallet. I would go 2% at the most.
You may want to look into some Icing types like CAP Butter Cream , CAP Cake Batter, TFA Bavarian Cream , TFA
Marshmallow, TFA or CAP vanilla bean ice cream
A lot of people will also throw a fruit in at this point just so they will have a more layered and not so simple experience.
You have to realize that the Icing flavors will have the Sweet taste and the TFA Vanilla Cupcake will not really be sweet at all. You would need TFA Sweetener unless you did an Icing and/or something like CAP Sweet Strawberry.
Just adding more TFA Vanilla Cake will not make a recipe sweeter. It will make the recipe taste more like the Vanilla Cake up until you hit the threshold of where it just tastes bad or you can't taste it at all.
I also recommend to not stick with just TFA and LA. I did that back when I first started because I was ordering from ecigexpress and that was about all they carried. Capella and Flavor Art have some amazing flavors that TFA and LA do not have.
Another recommendation is to find popular recipes and mix them instead of trying to go single flavor and/or creating a recipe from scratch. There are guys here that have been doing this for years and you are better off learning what flavor percentages and what flavors work together before you just start throwing stuff together.
Instead of buying like TFA Vanilla Cupcake and say TFA Bubblegum because they both sound amazing. You may want to look up a Cupcake recipe or bubblegum recipe and buy the few flavors listed for that recipe. Reason being is that there are not a whole lot of stand alone flavors out there that will satisfy you if you have been buying premium brand juice from big name retailers.
Not trying to poop on your parade at all. Just stating some things that I wish someone would have told me before I bought a bunch of LorAnn flavors that no one hardly uses in recipes. After wasting a lot of VG I can see why. Not saying LorAnn is bad, but some of them are very potent I know one drop of their raspberry seems to take over most recipes I have tried.