Centerboard SSteel vs line
Often I was replacing the centerboard cable on my Irwin 34, a rope wire splice was involved, so not easy. SIX years ago I went to warpspeed line with the amsteel core, No problems yet. Believe the past failures were not due to chafe but corrosion of the SS, which always displayed a tapering cone of wire.
My advice try line it lasts longer under water.