Having tried most every different line and line combination out there - fat, thin, fuzzy, slick, 12 strand, double braid, poly, dacron, vectran, spectra, stripped, spliced, diced, smothered and covered, etc. (it's nice to have a warehouse full of string...)

What works for me is 8mm Robline Racing Sheet spliced to 5mm 12-strand spectra on the 10:1 F18 mainsheet. On the A-cat I use the same products but downsize to 6mm Racing Sheet spliced to 3mm 12-strand spectra.

I tend to like the smaller diameter lines, however some of my customers really like the 9mm racing sheet on the handling end.