you will never have a problem with fluorocarbon as long as you use the 100% fluorocarbon and wet the line good before you clinch your knot tight. I think the fluorocarbon has more friction when you cinch your knot tight which can weaken it.
I fished the south end this morning and caught one small rainbow on a cheater with a Sutton 44. I also had 3 lakers and another rainbow that I lost close to the boat. all fish were on spoons. no fleas but lots of weeds.
I fished keuka sunday and only caught one lake trout trolling. I know a charter that has been skunked three days in a row. he also trolls. maybe jigging or fishing with sawbellies would be the answer. good luck