Never used any of the additives.
I've got black cherry on order, so don't know how strong it is and I wouldn't buy chocolate, but I imagine that would be quite a strong flavour. Vanilla isn't overwhelming, but cream is
So I'd probably start out with about 10% overall flavour with black cherry dominant, followed by vanilla, chocolate, cream. As 50 drops is 1ml by my measurement, I'd start out with BC 10, vanilla 8, choc 5, cream 2 & top up with base to 5ml, then tweak based on sniff/taste tests. If flavour's good but too weak, easy to increase to 15 or 20% after testing by multiplying quantities
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