I use fluorocarbon tippet when fly fishing subsurface. I use 6 lb. mono on my spinning gear but have been thinking about trying fluorocarbon.
Have you experimented with fluorocarbon? It is supposed to be nearly invisible under water.
Also, I picked up a tip on tying flies at the Expo. As bluegill are also sensitive to smell it was recommended to use a water based glue, instead of normal super glue when tying flies.