We fished with 5000s and 6000s, 5500s and 6500s, I even have a Chinese 6600, but I had never even seen these larger models designed for saltwater until I started collecting reels
My only gripe with the reel is that the breaking system is touchy and you really have to dial it in to get a perfect, backlash free cast
Consider using soft plastic worms, hair jigs, curly tail grubs, suspending jerkbaits, Ned rigs, and shakyhead jigs during winter
But more than likely, it means the knot you used to tie the line to the reel spool was too bulky and caused a mini mountain to form on one side of the reel
While you can do it without losing all the line, you'll still likely lose a lot in process
It minimizes the weight that can become a stress factor in close-range pitching, where only wrist power is used to complete casting, action, and hooking