Very interesting session for me as conditions were typical harbour open water chop so I thought I would try the Select High Wind 35 in the F90.  This fin sounds very big for this combo but infact feels a little under size.  It is a low power fin with higher legth and surface area giving the most secure feeling in the chop I ever had.  No tail walking, no spinout, no feeling of being close to the edge...so intersting getting  a spot PB for 500m by 1 knot!  Really there is no point in sailing too close to the edge if your limiting factor is chop and you need to slow down every time you hit some difficult terrain.  Also helped by my new sails :)