Interesting...
The
juice came in the carts, or a bottle? (I've never thought any juice that came in a cart or carto tasted worth a darn.)
Different juice producers do it differently, so another Marl may taste different, or may taste the same. I have only had luck with Halo for premixed stuff and I haven't used any premixed in many months.
So, if you have a bottle of juice, you can find out how much clear vanilla it is going to take to make it vapable. Transfer a small amount to another bottle and add a tiny amount of your clear vanilla. (Keep notes). Drip your mixture on your atty & taste. If it is not enough, then add more. (Keep notes) and try again.
Mix small and keep notes. Once you have the right flavor then you can attempt a larger attempt.
I am curious why you are starting out with 0nic though. I have a cousin going that route because of her latest baby, but she's having a tough time adjusting. (Might not just be the 0nic as, I have heard, there are a number of chemicals going through women at that time. Being a guy, I avoided all that and only had to deal with the results.)