Been using 6lb fireline for the lake trout for 15 years now. It has a breaking strength of more like 13lbs or so. I pair that with a 5ft to 10ft leader of flouro. Big fan of the seaguar in the red box. I normally run a 12lb flouro leader, but i will drop down to 8 if the fish fish want small lures.
Lure wise, if you can make them chase, nothing beats a swimbait with a good tail kick