Looking for advice for fins for the 95 dyno.

I weigh 78kg and am using a 5.3 and looking for a single fin option for a more blasting role/staying upwind/but lumpy water state.

K4 fsw 25cm looks ok but maybe 27cm. Or maybe something very different like ifin air 28cm?

Windsurf test says the dyno prefers upright fins as large fins with too much rake spin out. This is contrary too observations with weed fins of other sailors.

Tia.