following the guidelines given by [color:"green"] Glenn (Ashby) :

Mast set up:

0 to 10kts 40mm rake, 15 to 25 mm pre bend

10 to 15kts 50mm rake, 25 to 35mm pre bend

15 to 20kts 60 to 70mm rake and 35 to 40mm pre bend.
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I think 25 mm are far of the pace. Furthermore,

[color:"black"] [/color] I sail singlehanded with a sloopsail, so the sail is much to full in profile, and saying this, after sailing the boat twice, I am totally unhappy with the current shape and behaviour of the sail.

I strongly believe, setting much spreader rake as a default and changing the diamond tension even out of the trapeze which became quite used by several sailors in the A-cat again is a good thing, specially if you sail with a much to bulbous sail on a mast which is to stiff...

you all use the adjustable proctor spreaders?