Tried Fireline as my main Carolina rig line as you suggested in an old thread, and had a terrible time with it. Yes, there was better sensitivity ... but:

1. Kept getting my sinker hung in rocks. Mono = break off at sinker and retie leader. Fireline = troll back to spot and try to get it to come loose.
2. Worst of all, I broke off three times setting the hook (only three bites) the first 30 minutes I used it. I was using 14 lb. Vanish for my leader. I tied only Trilene knots, no palomars. All the break-offs were at the hook of the leader. The first time I set the hook like I normally do with mono, which I figured may have been too hard. The next two times I barely set the hook at all.

I ended up converting one of my other rods into a C-rig rod, then switched back to a spinner bait after dark.

Any idea what I was doing wrong?