I find Vape Wizard and Smooth to both completely destroy the flavour I have in my mixes. That said, I haven't tried it in that low a quantity - usually at 0.4% - 0.6%.I believe that just a drop of MTS Vape Wizard also helps to round out harsh edges in fruits. I have a whole bottle of it and won't be using it in anything else so... I think Oba Oba could serve much the same function. I believe skiddlz also adds a drop or two of Inw Eucalyptus Mint to fruits, although that is more to perk them up than to cut the harshness.