Might take some testing cause all the Banana flavoring brands are so different.
Or, if you've got a favorite already, use that.
I kinda like TFA Banana Cream myself.
Just guessing here
5% TFA Banana Cream or (1% TFA Ripe Banana)
7% FW Salted Caramel
Got TFA and FA caramel, I'm just looking for the salty note, I suppose they use some kind of chemical which is more concentrated then salt and doesn't crystalize, I just don't know what it is.