2 CENTS
"Gelspun lines have sometimes been described as being more resistant to abrasion than mono lines.My tests indicate that of the two lines with the same diameter,one gelspun,one monofilament-each under the same load-the gelspun will resist abrasion better than the monofilament.
However,of the two lines with the same breaking strain,one mono,the other gelspun-each under the same load-the monofilament will resist abrasion better than the gelspun line.This is an important consideration when choosing between gelspun and monofilament lines for fishing amongst rocks or other submerged objects""
With aknowledgement to Geoff Wilson' from his "guide to Braid, Dacron & Gelspun lines."
Having said/written that ,I have used Spectra Power-Pro Gelspun, 55kg @.46mm diameter knotted to a Bimini with two figure 8's in a 1,2 meter length for spinning various species with great success,tied directly to the mainline of.55mm of choice.
Just another angle.