RE: 6.5 sail for gusty lake sailing
Glad to hear the Retro 6.5 m2 is working well with your NP X3 460 cm
Also very glad to hear that you've been able to "discover" how your Retro can be tuned with an adjustable outhaul.
Have you done any additional tuning with the downhaul?
That's another "feature" of the Retro.
If you need a sail that's a little less powerful, add a little downhaul and you can extend the range even further, then do the "fine tuning" with the adj. outhaul.
Hope this helps,