Re: Spectre rope
It makes more sense financially in bigger boats I think. Doing my hunter 25 refit last year I priced out the coligo vs rigging only steel, and the price of the fittings meant that the spectra rigging would have cost significantly more even though I got new turnbuckles for the steel.
However in bigger boats where a new turnbuckle might go for $600 itself, the synthetic rigging starts making sense.
I love the stuff personally, splicing it is easy but the splices really need to set, they stretch a lot until then, making precision very difficult.
Even if u don't go with all synthetic, u should consider making the back stay out of the stuff. Or making some soft shackles, those are very handy too.
As far as chafing goes, once u splice the stuff u will find that it is very hard to cut. U get maybe two or three cuts with a razor blade before it gets completely dull. I doubt genoa chafe will do much here, ESP if ur using soft shackles or bow lines to secure the sheets to the clew.