Sailing Flat

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Everyone says sail flat for speed. Yet the current Scots and water shows the winner (?) well over with main sheeted in pretty close. Last sumer a race was called so I had my old sails on. Probably 15 knots of wind.
Someone behind me with new raciing sails (and a good sailor, better than me anyway) was not keeping up. And yes we were healed over a lot just to see how it would run. Junk sails and moving well. I know he was surprized as he called out, "those arent your racing sails!"
Thoughts?
Jim Nighan
FS 760 - Skaneateles Fleet