Thank you for writing. I'll try the 460 mast on the 8.0.
If 2 masts are the same length and MCS can they still have different stiffnesses in their top halves.
I rig my 5.5 and 10.0 Retros on 75 % Maui Sails masts and they seem to work better.
Another problem - the strap at the top of my 8.0 broke recently. I have extra headcap straps from my 5.5 and 6.5 and hope to find someone local to sew one on. Would it be ok to sew the strap on the outside of the top of the sail? I think that would be easier for someone to do that isn't familar with windsurfing.