the Futura 111 gets delivered with a Drake Freeslalom Swift 380, which should fit for all three sailsizes. The board is 68 cm wide. You could get a bigger fin for the 7,5 to extend the lightwind performance, like a 42. I definitely would not go shorter than 34 cm.
You could think about a Drake Freeslalom Swift 340.
I would suggest: try the board with the 38 cm and decide afterwards.
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