Just to close that thread. Issue was only mine.
The main (NPC Nordac Radian 7.5) was perfect. Luff length was 37' 9 1/2" that is 2" 1/2 below max class length which is fine for me. (about 1" shorter than your 3Di Jim). 38" is exactly the max I get with my halyard topped out.
After spending more time on this, cleaning up a bit the mast groove, measuring with tack free. it at the ends boils down to this new main being really the first true class legal one I have on this boat.
My prior main was a bit shorter, shorter enough for me to deal with luff tension only with the halyard tension. Not something I can do anymore with this one.

all set. thanks fellows.


-- Georges
Foot Loose #467 - CPYC - Winthrop