For starters, even the original 6.0 had a bowfoil.
Are you 100% sure about this statement?
You may have been rated an N/A because of the squaretop.
Do you want to hang your hat on this one too?
None of the old NACRA boats, left the factory with a square top.
Further more Around 1992/1993 Performance Cats developed the NA version which had the bow foil, bigger jib, and a slightly bigger pin-top main. This added 9 Sq’ and that increase the sail area to 264. Also, the mast configuration changed from the regular 6.0 to the NA with the addition of a wider set of spreaders and a higher attachment point for the outer diamonds and the second set of inner diamonds.
BTW - Mr. Wet-Kitty the back in the day the Express was rated 59.7
