With regards to the regatta where we had winds in some races in excess of 30 knots and a peak gust of 36 knots, this was measured from a wind meter on the start boat. The winds slowly built (Strong sea breeze) and the proceeding races were cancelled.
We flew our kites in these winds along with Nacra 5.8s and F-18s and all made it around the race course - some with a few swims. A class boats were also racing and survived without damage.
And as far a prefering to be on a cat than a mono when a sqall hits, I agree. Was caught out in a 60 knot front (offically recorded by the Beuro of Meterology) during a race and was forced to ride it out on the top of the up turned cat. Try hanging onto the top of an upturned mono in these conditions.