RE: Kashy Formula Fins XXS
I have never try the fin in 25-30 kn, but in 20-22 kn i have reached 28 knots speed.
I only have 1 sail,RS6 10.7, and 2 Kashy fins. XS 68 and XS 70, and it works from 8kn to 22 kn.
My weigth is about 75 kg and the fins are very stable, also in 20 kn.