Sounds like you have plenty of action to keep it interesting. It is frustrating when you can't seem to keep one buttoned....and the one that gets off at the boat is ALWAYS "huger", lol!
I've never f-n-fd, just read thousands of f-n-f posts here.....and the f-n-fers may correct me if I'm wrong.....but 15# fluoro seems a little heavy to me? I've heard of them using 8-10# fluoro for their leaders. The long action of the f-n-f rod, much like with fly fishing, will absorb much of the fight allowing you to use lighter lines. I am a life long fly fisherman, and I have caughten 10lb fish on 4lb line, thanks to the fly rod. Just an IFY.
Come on f-n-fers, chime in on this one.
-Rich