For flavouring duh... Jokes. But serious. Your best bet to learn the flavours and get an idea of what does what, is mix the flavours as a 10% solution standalone and try them for yourself. There's literally hundred if not thousands of flavours, making single posts to find out what each one does...
7. Sweet cream is a sweet cream, bavarian cream is a sweet cream with an almost marshmallow flavour.
8. Capella chocolate glazed is the best if you want chocolate doughnut, capella glazed doughnut is better that TFA frosted doughnut.
You'll dilute the flavour by adding VG, I would mix another 30mls of the same recipe with out any nic and just add it to that 40ml you have left, that should be more or less 2mg, maybe someone can do that exact maths for you ;)
You mind sharing your recipe? I find that some flavours also have a throat hit, most noticeably the citrus flavours orange, lemon etc. EM (ethyl maltol) sometimes helps take the edge off. Here's a nice rundown of every possible reason your juice could be coming out harsh. I would experiment and...
These guys have clear ones. Just bought from them excellent service. Also great range of concentrates and good prices:
https://www.blckvapour.co.za/collections/accesories/products/copy-of-dropper-bottle-clear-30ml-glass
Give this one a try if you haven't already:
Mustard Milk - Simple Strawberries and Cream
Ingredient %
Strawberry (TPA) 6
Vanilla Bean Ice Cream (TPA) 8
Yep tried it, it's good, not mind blowing or anything but very decent recipe. I've never tried unicorn milk so can't comment on the similarity, From what I've read though it's not the real recipe.