Fireline not winding tight on retrieve, very loose!
Try letting the line out behind the boat without a bait on it or anything. Troll at a slow speed for a few hundred yards. Then hold the rod tip in the water reel it in while pinching the line. That should help.. I love 8lb fireline but 10lb seems to give me trouble. fireline works perfect for skipping wacky worms behind docks.
But it's one reason I don't care fire fire linence it starts getting easy to use its also starting to fray just a little. I prefer PP.
By going to the lighter Fireline it will lay much nicer and tighter on the spool, with less tension.
With a 4# leader, 4# Fireline is plenty - and will cast MUCH nicer too.