Thanks for the feedback... I get that "loose" equals sloppy rig, and lost power, and therefore tight is better, unless it prevents mast rotation when you need it. Beyond that, your feedback suggests it is a "set and forget" thing - but sailing never seemed that simple! I figured there must be some benefit to small or moderate changes from the average.

I have asked the same on the Shadow forum, but again no numbers are given (yet)!