I would say it is a combination of the two, Dennis. If I can fit it through the hook eye I fish 4x flouro. If I have to I drop down to 5x. Even using 4 and 5x I still catch wild wary fish from streams x, y and z consistently. A 6wt isn't well suited for protecting tippet and if you have a stiffer faster action rod that only compounds problems. The softer the rod, the more it protects the tippet.