I tried an experiment last year, I have removable, non-telescoping 18' Lee outriggers on my T-top. I setup one side with mono and one with nylon. The mono was a B*TCH to work with when removing or installing the riggers. It would twist too much and was almost impossible to get correct, especially in any kind of sea.
Mono is gone this year, using nylon-with-large swivel for adjustment worked great for attaching it to the gunnel, tension was easy. Mono may work for fixed riggers, but when you have to remove it, it was horrible.
My $.02
Patrick
Pat N Mike