Re: Rig cable tension
Try to get your hands on (ironically enough) a 'Loos gauge'.. it's a tool for adjusting rigging tension repeatably. As far as the actual specs for that boat, hopefully someone will chime in. I believe the gauge comes with some guidelines by wire size.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)