It doesn't matter because the various lures will ultimately add twist over time so I periodically stretch it and respool it. Basically hook it to a tree and walk it all off, Stretch it with the rod, then snip the line at the tree and reel it back on. This fixes the most stubborn mono. I do not run straight fluoro, its just not practical and certainly not necessary. I second Sunline Sniper and P line tactical but have had good success with others.