I was out today and having just switched to mono on my downrigging rods, I am finding that the releases on the cannonballs do not release. I was towing my catches rather than fighting my catches. I had a monster sheepshead on the line at the end of the day, ~10 pounds I estimate, and even that did not trigger the release. One will release as I am lowering the cannonball to depth, and I have to start over with the setup, like 4 times in a row. Then line further back in the clamp, and no release.
What am I doing wrong?