Nacra SQ,
The Sori is a nice lightweight for an aluminium mast.
We had the Sori masts back in the 80s. As this was before the square top main sails the masts were tapered. Had they invented square tops there would have been no need back then to taper the mast. Just wondering if your Sori is tapered?

Regards,
Phill

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!