If you have local access to GSport fins then the Gsport B&J is a very powerful (and good) fin. I use the 26.7 cm version (the biggest of them) for sails up to 7 m2 on a 64 cm wide board. One size smaller (24 cm) should fit your smaller board well.
On the other hand, I have used the same fin on my RRD FSW 94 (60 cm wide) with very good low end power, especially for the 6.2 sail.
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