The shorter shock tippet may result in a few fish biting through the class tippet but I have found that I can get a much larger number of fish to bite the fly. I am careful to use lines that are camouflage in some way. A few years ago I began fishing with the clear fly lines on the market. I have had great success with both the floating and the sinking clear fly lines. There have been numerous and varied fish caught on my boat with clear lines that would have been spooked with a brightly colored line.
Clear lines are wonderful for barracuda and highly suggested.
I also dye my standard lines for all species. The colors that I have found least offensive to permit, tarpon, bonefish, and barracuda are olive, black, dark green, and brown. I use rit dye or waterproof markers to color the lines permanently. These colored lines resemble the natural vegetation in the water and have proven to spook fewer fish. For barracudas I prefer a clear line for the best and most stealthy presentation.