Also worth considering Inawera Vanilla Bourbon, unless you have already ruled it out? it is one of my most used concentrates in mixes. It is so much lighter and cleaner in the finished flavour it produces, than the heavy chemical tasting French Vanilla a lot of blended concentrates use.
I find with the (Inawera) one you only need a 0.5 - 1.5% in any mix to give a natural vanilla taste finish, it has a slight natural sweetness to it and produces great finished results in DIY tobacco mixes along with creams and bakery flavours.
Also found that if you add the Vanilla Bourbon to something that already has French Vanilla in it, the Vanilla Bourbon will tone it down massively. Makes things like Vanilla Custard/Creams and some RY4's that have too much French Vanilla for my tastes, more palatable.
I would imagine the Flavourart and Inawera may be very similar products and require similar %'s in mixes, as for the TFA never tried it, but looking at other people's notes requires >5% as the finished flavour can be weak
