Only use Fluor tippet has no effect on pulling down dry flys, catches more fish than mono. Was taught a lesson on Fluor few years back . Was fishing with a buddy one day in a boat .i was using mono we were fishing same nymph under a indicator he out fished 10 to 1 after a half day . He finally gave a spool of Fluor . I started catching as many as he did. Only difference was Fluor . Since that day I have used nothing but Fluor. When Fluor 1st . It the market I refused to pay extra for Fluor and he new it . Just a lesson on being closed mind about new intimations.