Lot's of my friend from Croatia go every year to Karphatos, and there also they have speed of Karphatos. Hrm, Maybe one of them will try to explore this spot, didn't hear about Drepano. Looking interesting. Winds in Greek are mostly very stron, some local termic wind called Moltoni or something like that, there was a time that was blowing from 6-9 bft every day
I wrote some blogpost about Karpathosm my favourite place in the world:
www.andersbq.com/2010/11/karpathos-in-paradise-playing-with.html
and some more www.andersbq.com/search/label/Greece
It is the most reliable place on the world for strong winds.
Better than WA in the summer!
Here is a "map" over Devils / Paradise Bay aka Afiarti:
www.andersbq.com/p/karpathos-speed-week-2011.html