Another problem you might be having is line fraying. Fireline requires smooth nylon eye guides. If you have one missing and its just metal, then that could do it. Check your line for little ticks and cuts. Also check your reel roller (I'm assuming a spinning reel...but might be wrong). So check anything on your rod/reel the line comes in contact with, any damage will really tear up the fireline. I've been using fireline, for a long time, but only for certain fishing situations. Pretty much I only use it when fishing in deep water when 0 stretch is necessary (try to feel a northern pick up a jig 60 ft down, and how ever far away with mono...). For almost all other applications I still use mono or florocarbon. Hope this helps
I use the 15 lb round fireline and absolutely love it! Last winter though, I used the flat crap and had nothing but problems with it. Never go flat again!! The round ties a great knot, takes the lickin and keeps on tickin!! I fish rocks, weeds, flats and all kinds of structure. No problem with the round. Mind you, the pro bass hook sets have to change a bit...lol. Good luck with it, after you get used to good fireline you'll never go back to mono.
That last statement is totaly bogus. I can name a bunch of reasons you would want mono (our flouro) over braid. 1: Topwater baits (to keep the bait on the surface, braid sinks)2: Crankbaits( to get maximum depth out of cranks, braid resists water which makes baits ride up higher in the water column) 3: Fishing clear water (braid is visible) 4: Slip bobber fishing (braid doesn't slip through the bobbers very well)5: Throwing light lures (braid will dig into itself and make casting light lures very difficult)