Same juice stronger nic and mix to your 3mg..adding anything else will completely weaken and alter juice...so order some 6ml mix one to one with your 0mg for 20ml of your lovelyness
and as said, it could well weaken the taste as you are using 10ml bottles. 50ml shortfills are usually mixed slightly stronger so as when you add nic shots it wont lose the full flavour taste.