Long leaders and tippets make accuracy harder to achieve. A shorter leader with a thick butt will efficiently transfer casting energy to the fly. Use strong tippet to deliver the fly with authority, give you a chance of recovering snagged flies and let you take the fight to the fish. I don’t use fluorocarbon because it doesn’t degrade when snagged and can leave a fly dangling where it poses a risk to wildlife. Nylon tippet degrades rapidly when exposed to sunlight, weakening quickly to the point where it no longer poses a threat. If you do lose a fly or leader make every attempt to retrieve it if it is safe to do so. Using more than one fly makes it harder to create the narrow loop needed for accurate presentation and increases the chances of leaving a fly dangling from the branches. If I can cast upstream into clear water and allow a duo (dry-fly and nymph or two dry-flies) to drift under a tree without casting towards the branches then I occasionally use two flies. Two-fly set-ups greatly increase the likelihood of losing a fish if it dives for the roots.