So to conclude: YES. Banana's DO make a difference to dream recall and vividness in MY experience, but I have heard banana's are full of b6, so it's probably just as well to go for the supplements. (especially if you don't like banana's!)
Nice to see the positive results, but you might want to test it a few more times whenever you do a research. There's many variables that can be present in one single day which makes it hard to tell what exactly made you experience great dream recall, such as expectations, another food you ate, dream recall improvement by it's own, etc etc.

Still, you took your time to dig the information and correctly guess what makes banana's good for dream recall ^^ Are you planning to try this with more foods? Would be interesting to see