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.
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.