If you are using blacks just make sure you give a good amount of twists before inserting the loop in the release to prevent slippage when you tighten down to load rod. As bluegiller suggests, as the ball descends, keep line taught. If you use a Scotty downrigger with manual clutch, descend slowly and don’t freefall. Make sure everything is angled straight out the back, paralleling the down-current direction so things don’t go sideways upon descent. If you are doing all these things now and still getting tangled, I don’t know what to tell you.