No secrets to speak of... the same stuff you use on winni works there. Keep having faith in the flies though... sounds like they are what catches the real lunkers in that lake. Only thing I can say is have lots of patience waiting for the big one. I've been a couple times when we only caught a couple fish... but they were big. As long as you're with good friends time will pass quickly though. Sure is a beautiful lake. Make sure you keep an eye out for the eagles. The pair that was there this spring was huge.
I'm sure John could tell you better where to fish and what people have been catching them on this week.
Good luck.
I'm headed out fishing now... see ya.