Lines for your loop rod
Forgot to add a couple of things (lets add confusion to the pot :hehe: ) "Doc" got you to the International Spey Casting board; from here jump to the "Spey Pages." Dana has write ups on several rod-line combinations. Suspect your Loop rod was also covered here.
One other (Rio lines only) good place for line/rod match up info is RIO's home site, then to Simon's recommendations. He covers almost any two hander ever made.