I have found when making an fpac aka tweaking or blending, the simple rule is that whatever flavour you add last predominates, the overall flavour and if used with caution works well, to change the flavour the way you want, whether subtely or substantially, depending, on how much you add, use it with caution, is the thing to remember, IMHO they are also easy to add , because, they predominate, the overall flavour, just dont do it when you have had a few ;-) because when u sober up the flavour isnt how u imagined it, the night before ;-)